add serial/socket plugin example

Daemons/weatherdaemon_multimeteo/CMakeLists.txt

@@ -0,0 +1,65 @@
+cmake_minimum_required(VERSION 3.20)
+set(PROJ weatherdaemon)
+set(MAJOR_VERSION "0")
+set(MID_VERSION "0")
+set(MINOR_VERSION "1")
+
+aux_source_directory(${CMAKE_CURRENT_SOURCE_DIR} SOURCES)
+#set(SOURCES main.c cmdlnopts.c sensors.c)
+
+set(VERSION "${MAJOR_VERSION}.${MID_VERSION}.${MINOR_VERSION}")
+project(${PROJ} VERSION ${VERSION} LANGUAGES C)
+message("VER: ${VERSION}")
+
+# list of options
+option(DEBUG "Compile in debug mode" OFF)
+option(DUMMY "Dummy device plugin" ON)
+option(FDEXAMPLE "Example of file descriptor plugin" ON)
+
+
+# default flags
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -W -Wextra -fno-builtin-strlen")
+
+message("Install dir prefix: ${CMAKE_INSTALL_PREFIX}")
+
+add_definitions(-D_XOPEN_SOURCE=1234 -D_DEFAULT_SOURCE -D_GNU_SOURCE
+        -DPACKAGE_VERSION=\"${VERSION}\" -DMINOR_VERSION=\"${MINOR_VERSION}\" -DMID_VERSION=\"${MID_VERSION}\"
+        -DMAJOR_VERSION=\"${MAJOR_VESION}\")
+
+set(CMAKE_COLOR_MAKEFILE ON)
+
+# cmake -DDEBUG=on -> debugging
+if(DEBUG)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Og -g3 -ggdb -Werror")
+    add_definitions(-DEBUG)
+    set(CMAKE_BUILD_TYPE DEBUG)
+    set(CMAKE_VERBOSE_MAKEFILE "ON")
+else()
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O3 -march=native -fdata-sections -ffunction-sections -flto=auto")
+    SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--gc-sections -flto=auto")
+    set(CMAKE_BUILD_TYPE RELEASE)
+endif()
+
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}")
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(${PROJ} REQUIRED usefull_macros>=0.3.2)
+
+#include(FindOpenMP)
+#if(OPENMP_FOUND)
+#    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
+#    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}")
+#    add_definitions(-DOMP_FOUND)
+#endif()
+
+# exe & lib files
+add_executable(${PROJ} ${SOURCES})
+target_link_libraries(${PROJ} ${${PROJ}_LIBRARIES} -lm ${CMAKE_DL_LIBS})
+target_include_directories(${PROJ} PUBLIC ${${PROJ}_INCLUDE_DIRS} .)
+target_link_directories(${PROJ} PUBLIC ${${PROJ}_LIBRARY_DIRS} )
+set_target_properties(${PROJLIB} PROPERTIES VERSION ${VERSION})
+
+include(GNUInstallDirs)
+# Installation of the program
+install(TARGETS ${PROJ} DESTINATION "bin")
+
+add_subdirectory("plugins")

Daemons/weatherdaemon_multimeteo/Readme.md

@@ -0,0 +1,22 @@
+Weather daemon for several different weather stations
+=====================================================
+
+## Usage:
+
+```
+Usage: weatherdaemon [args]
+    Be careful: command line options have priority over config
+    Where args are:
+
+  -P, --pidfile=arg    pidfile name (default: /tmp/weatherdaemon.pid)
+  -c, --conffile=arg   configuration file name (consists all or a part of long-named parameters and their values (e.g. plugin=liboldweather.so)
+  -h, --help           show this help
+  -l, --logfile=arg    save logs to file (default: none)
+  -p, --plugin=arg     add this weather plugin (may be a lot of) (can occur multiple times)
+  -v, --verb           logfile verbocity level (each -v increased)
+  --port=arg           network port to connect (default: 12345); hint: use "localhost:port" to make local net socket
+  --sockpath=arg       UNIX socket path (starting from '\0' for anonimous) of command socket
+```
+
+
+TODO: brief documentation will be here

Daemons/weatherdaemon_multimeteo/cmdlnopts.c

@@ -0,0 +1,164 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include <strings.h>
+#include <usefull_macros.h>
+#include "cmdlnopts.h"
+
+/*
+ * here are global parameters initialisation
+ */
+int help;
+
+// default values for Gdefault & help
+#define DEFAULT_PORT    "12345"
+#define DEFAULT_PID		"/tmp/weatherdaemon.pid"
+
+//            DEFAULTS
+// default global parameters
+static glob_pars defpars = {
+    .port = DEFAULT_PORT,
+    .logfile = NULL,
+    .verb = 0,
+    .pidfile = DEFAULT_PID
+};
+// default config: all values should be wrong or empty to understand than user change them
+static glob_pars defconf = {
+    .verb = -1,
+};
+
+static glob_pars G;
+
+/*
+ * Define command line options by filling structure:
+ *  name        has_arg     flag    val     type        argptr              help
+*/
+#define COMMON_OPTS \
+    {"port",    NEED_ARG,   NULL,   0,      arg_string, APTR(&G.port),      "network port to connect (default: " DEFAULT_PORT "); hint: use \"localhost:port\" to make local net socket"}, \
+    {"logfile", NEED_ARG,   NULL,   'l',    arg_string, APTR(&G.logfile),   "save logs to file (default: none)"}, \
+    {"pidfile", NEED_ARG,   NULL,   'P',    arg_string, APTR(&G.pidfile),   "pidfile name (default: " DEFAULT_PID ")"}, \
+    {"sockpath",NEED_ARG,   NULL,   0,      arg_string, APTR(&G.sockname),  "UNIX socket path (starting from '\\0' for anonimous) of command socket"}, \
+    {"plugin",  MULT_PAR,   NULL,   'p',    arg_string, APTR(&G.plugins),   "add this weather plugin (may be a lot of); FORMAT: \"dlpath:l:dev\", where `dlpath` - path of plugin library; `l` - 'D' for device, 'U' for UNIX-socket or 'N' for INET socket; dev - path to device and speed (like /dev/ttyS0:9600), UNIX socket name or host:port for INET"}, \
+    {"pollt",   NEED_ARG,   NULL,   'T',    arg_int,    APTR(&G.pollt),     "set maximal polling interval (seconds, integer)"},
+
+sl_option_t cmdlnopts[] = {
+    {"help",    NO_ARGS,    NULL,   'h',    arg_int,    APTR(&help),        "show this help"},
+    {"conffile",NEED_ARG,   NULL,   'c',    arg_string, APTR(&G.conffile),  "configuration file name (consists all or a part of long-named parameters and their values (e.g. plugin=liboldweather.so:D:/dev/ttyS0:115200)"},
+    {"verb",    NO_ARGS,    NULL,   'v',    arg_none,   APTR(&G.verb),      "logfile verbocity level (each -v increased)"}, \
+    COMMON_OPTS
+    end_option
+};
+
+sl_option_t confopts[] = {
+    {"verbose",  NEED_ARG,  NULL,   'v',    arg_int,    APTR(&G.verb),      "logfile verbocity level"}, \
+    COMMON_OPTS
+    end_option
+};
+
+static int sortstrings(const void *v1, const void *v2){
+    const char **s1 = (const char **)v1, **s2 = (const char **)v2;
+    return strcmp(*s1, *s2);
+}
+
+// compare plugins from configuration and command line; add to command line plugins all new
+static void compplugins(glob_pars *cmdline, glob_pars *conf){
+    if(!cmdline) return;
+    char **p;
+    int nconf = 0;
+    if(conf){
+        p = conf->plugins;
+        if(p && *p) while(*p++) ++nconf;
+    }
+    int ncmd = 0;
+    p = cmdline->plugins;
+    if(p && *p) while(*p++) ++ncmd;
+    DBG("Got %d plugins in conf and %d in cmdline", nconf, ncmd);
+    // compare plugins and rebuild new list
+    int newsize = ncmd + nconf;
+    if(newsize == 0) return; // no plugins in both
+    char **newarray = MALLOC(char*, newsize + 1); // +1 for ending NULL
+    for(int i = 0; i < ncmd; ++i){ newarray[i] = cmdline->plugins[i]; }
+    FREE(cmdline->plugins);
+    if(conf){
+        for(int i = 0; i < nconf; ++i){ newarray[i+ncmd] = conf->plugins[i]; }
+        FREE(conf->plugins);
+    }
+    qsort(newarray, newsize, sizeof(char*), sortstrings);
+    DBG("NOW together:"); p = newarray; while(*p) printf("\t%s\n", *p++);
+    p = newarray;
+    int nondobuleidx = 0;
+    for(int i = 0; i < newsize;){
+        int j = i + 1;
+        for(; j < newsize; ++j){
+            if(strcmp(newarray[i], newarray[j])) break;
+            FREE(newarray[j]);
+        }
+        if(nondobuleidx != i){
+            newarray[nondobuleidx] = newarray[i];
+            newarray[i] = NULL;
+        }
+        ++nondobuleidx;
+        i = j;
+    }
+    DBG("Result:"); p = newarray; while(*p) printf("\t%s\n", *p++);
+    cmdline->plugins = newarray;
+    cmdline->nplugins = nondobuleidx;
+}
+
+/**
+ * Parse command line options and return dynamically allocated structure
+ *      to global parameters
+ * @param argc - copy of argc from main
+ * @param argv - copy of argv from main
+ * @return allocated structure with global parameters
+ */
+glob_pars *parse_args(int argc, char **argv){
+    G = defpars; // copy defaults
+    // format of help: "Usage: progname [args]\n"
+    sl_helpstring("Usage: %s [args]\n\t" COLOR_RED "Be careful: command line options have priority over config" COLOR_OLD "\n\tWhere args are:\n");
+    // parse arguments
+    sl_parseargs(&argc, &argv, cmdlnopts);
+    DBG("verb: %d", G.verb);
+    if(help) sl_showhelp(-1, cmdlnopts);
+    if(argc > 0){
+        WARNX("You give %d unused parameters:", argc);
+        while(argc) printf("\t%s\n", argv[--argc]);
+    }
+    DBG("PARS: \n-------------\n%s-------------\n\n", sl_print_opts(cmdlnopts, 1));
+    if(G.conffile){ // read conffile and fix parameters (cmdline args are in advantage)
+        glob_pars oldpars = G; // save cmdline opts
+        G = defconf;
+        if(!sl_conf_readopts(oldpars.conffile, confopts)) ERRX("Can't get options from %s", G.conffile);
+        DBG("CONF: \n-------------\n%s-------------\n\n", sl_print_opts(confopts, 1));
+        if((0 == strcmp(oldpars.port, DEFAULT_PORT)) && G.port) oldpars.port = G.port;
+        if(!oldpars.logfile && G.logfile) oldpars.logfile = G.logfile;
+        if(!oldpars.verb && G.verb > -1) oldpars.verb = G.verb;
+        if((0 == strcmp(oldpars.pidfile, DEFAULT_PID)) && G.pidfile) oldpars.pidfile = G.pidfile;
+        if(!oldpars.sockname && G.sockname) oldpars.sockname = G.sockname;
+        // now check plugins
+        compplugins(&oldpars, &G);
+        G = oldpars;
+    }else compplugins(&G, NULL);
+    DBG("RESULT: \n-------------\n%s-------------\n\n", sl_print_opts(cmdlnopts, 1));
+    DBG("Nplugins = %d", G.nplugins);
+    return &G;
+}
+

Daemons/weatherdaemon_multimeteo/cmdlnopts.h

@@ -0,0 +1,37 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+/*
+ * here are some typedef's for global data
+ */
+typedef struct{
+    char *sockname;         // UNIX socket name for internal connections (commands etc)
+    char *port;             // port for external clients
+    char *logfile;          // logfile name
+    int verb;               // verbocity level
+    char *pidfile;          // pidfile name
+    char **plugins;         // all plugins connected
+    int nplugins;           // amount of plugins
+    char *conffile;         // configuration file used instead of long command line
+    int pollt;              // sensors maximal polling interval
+} glob_pars;
+
+
+glob_pars *parse_args(int argc, char **argv);

Daemons/weatherdaemon_multimeteo/fd.c

@@ -0,0 +1,154 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// try to open device or socket that user pointed for plugin
+// WARNING!!! The `getFD` function intended for single use for each plugin!
+// WARNING!!! If you will try to close some plugins in running mode and open others, it
+// WARNING!!!     would cause to a memory leak!
+
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/un.h>  // unix socket
+#include <usefull_macros.h>
+
+#include "fd.h"
+
+/**
+ * @brief openserial - try to open serial device
+ * @param path - path to device and speed, colon-separated (without given speed assume 9600)
+ * @return -1 if failed or opened FD
+ * WARNING!!! Memory leakage danger. Don't call this function too much times!
+ */
+static int openserial(char *path){
+    FNAME();
+    int speed = 9600; // default speed
+    char *colon = strchr(path, ':');
+    if(colon){
+        *colon++ = 0;
+        if(!sl_str2i(&speed, colon)){
+            WARNX("Wrong speed settings: '%s'", colon);
+            return -1;
+        }
+    }
+    sl_tty_t *serial = sl_tty_new(path, speed, BUFSIZ);
+    if(!serial || !sl_tty_open(serial, TRUE)){
+        WARN("Can't open %s @ speed %d", path, speed);
+        return -1;
+    }
+    return serial->comfd;
+}
+
+static char *convunsname(const char *path){
+    char *apath = MALLOC(char, 106);
+    if(*path == 0 || *path == '@'){
+        DBG("convert name starting from 0 or @");
+        apath[0] = 0;
+        strncpy(apath+1, path+1, 104);
+    }else if(strncmp("\\0", path, 2) == 0){
+        DBG("convert name starting from \\0");
+        apath[0] = 0;
+        strncpy(apath+1, path+2, 104);
+    }else strncpy(apath, path, 105);
+    return apath;
+}
+
+/**
+ * @brief opensocket - try to open socket
+ * @param sock - UNIX socket path or hostname:port for INET socket
+ * @param type - UNIX or INET
+ * @return -1 if failed or opened FD
+ */
+static int opensocket(char *path, sl_socktype_e type){
+    FNAME();
+    DBG("path: '%s'", path);
+    int sock = -1;
+    struct addrinfo ai = {0}, *res = &ai;
+    struct sockaddr_un unaddr = {0};
+    char *node = path, *service = NULL;
+    ai.ai_socktype = SOCK_STREAM;
+    switch(type){
+    case SOCKT_UNIX:
+        {
+        char *str = convunsname(path);
+        if(!str) return -1;
+        unaddr.sun_family = AF_UNIX;
+        ai.ai_addr = (struct sockaddr*) &unaddr;
+        ai.ai_addrlen = sizeof(unaddr);
+        memcpy(unaddr.sun_path, str, 106);
+        FREE(str);
+        ai.ai_family = AF_UNIX;
+        //ai.ai_socktype = SOCK_SEQPACKET;
+        }
+        break;
+    case SOCKT_NET:
+    case SOCKT_NETLOCAL:
+        //ai.ai_socktype = SOCK_DGRAM;
+        ai.ai_family = AF_INET;
+        char *delim = strchr(path, ':');
+        if(delim){
+            *delim = 0;
+            service = delim+1;
+            if(delim == path) node = NULL; // only port
+        }
+        DBG("node: '%s', service: '%s'", node, service);
+        int e = getaddrinfo(node, service, &ai, &res);
+        if(e){
+            WARNX("getaddrinfo(): %s", gai_strerror(e));
+            return -1;
+        }
+        for(struct addrinfo *p = res; p; p = p->ai_next){
+            if((sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) < 0) continue;
+            DBG("Try proto %d, type %d", p->ai_protocol, p->ai_socktype);
+            if(connect(sock, p->ai_addr, p->ai_addrlen) == -1){
+                WARN("connect()");
+                close(sock); sock = -1;
+            } else break;
+        }
+        break;
+    default: // never reached
+        WARNX("Unsupported socket type %d", type);
+        return -1;
+    }
+    DBG("FD: %d", sock);
+    return sock;
+}
+
+/**
+ * @brief getFD - try to open given device/socket
+ * @param path - rest of string for --plugin= (e.g. "N:host.com:12345")
+ *          WARNING!!! Contents of `path` would be modified in this function!
+ * @return opened file descriptor or -1 in case of error
+ */
+int getFD(char *path){
+    if(!path || !*path) return -1;
+    char type = *path;
+    path += 2;
+    switch(type){
+        case 'D': // serial device
+            return openserial(path);
+        case 'N': // INET socket
+            return opensocket(path, SOCKT_NET);
+        case 'U': // UNIX socket
+            return opensocket(path, SOCKT_UNIX);
+    }
+    WARNX("Wrong plugin format: '%c', should be 'D', 'N' or 'U'", type);
+    return -1;
+}

Daemons/weatherdaemon_multimeteo/fd.h

@@ -0,0 +1,21 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+int getFD(char *path);

Daemons/weatherdaemon_multimeteo/main.c

@@ -0,0 +1,102 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/wait.h> // wait
+#include <sys/prctl.h> //prctl
+#include <usefull_macros.h>
+
+#include "cmdlnopts.h"
+#include "sensors.h"
+#include "server.h"
+
+static pid_t childpid = 0;
+
+void signals(int signo){
+    if(childpid){
+        LOGERR("Killed with status %d", signo);
+        closeplugins();
+        kill_servers();
+        usleep(1000); // let child close everything before dead
+    }else{
+        LOGERR("Main process exits with status %d", signo);
+    }
+    exit(signo);
+}
+
+static void getpipe(int _U_ signo){
+    WARNX("Get sigpipe!");
+    // TODO: check all sensors for disconnected one
+    signal(SIGPIPE, getpipe);
+}
+
+extern const char *__progname;
+
+int main(int argc, char **argv){
+    glob_pars *GP = NULL;
+    sl_init();
+    signal(SIGTERM, signals); // kill (-15) - quit
+    signal(SIGHUP, SIG_IGN);  // hup - ignore
+    signal(SIGINT, signals);  // ctrl+C - quit
+    signal(SIGQUIT, signals); // ctrl+\ - quit
+    signal(SIGTSTP, SIG_IGN); // ignore ctrl+Z
+    signal(SIGPIPE, getpipe); // socket disconnected
+    GP = parse_args(argc, argv);
+    if(!GP) ERRX("Error parsing args");
+    if(!GP->sockname) ERRX("Point command socket name");
+    if(GP->logfile){
+        sl_loglevel_e lvl = LOGLEVEL_ERR + GP->verb;
+        if(lvl >= LOGLEVEL_AMOUNT) lvl = LOGLEVEL_AMOUNT - 1;
+        DBG("Loglevel: %d", lvl);
+        if(!OPENLOG(GP->logfile, lvl, 1)) ERRX("Can't open log file");
+        LOGMSG("Started");
+    }
+    if(GP->pollt > 0){
+        if(!set_pollT((time_t)GP->pollt)) ERRX("Can't set polling time to %d seconds", GP->pollt);
+    }
+    int nopened = openplugins(GP->plugins, GP->nplugins);
+    if(nopened < 1){
+        LOGERR("No plugins found; exit!");
+        ERRX("Can't find any sensor plugin");
+    }
+    if(GP->nplugins && GP->nplugins != nopened) LOGWARN("Work without some plugins");
+    #ifndef EBUG
+    sl_check4running((char*)__progname, GP->pidfile);
+    while(1){ // guard for dead processes
+        childpid = fork();
+        if(childpid){
+            LOGDBG("create child with PID %d\n", childpid);
+            DBG("Created child with PID %d\n", childpid);
+            wait(NULL);
+            WARNX("Child %d died\n", childpid);
+            LOGWARN("Child %d died\n", childpid);
+            sleep(1);
+        }else{
+            prctl(PR_SET_PDEATHSIG, SIGTERM); // send SIGTERM to child when parent dies
+            break; // go out to normal functional
+        }
+    }
+    #endif
+    if(!start_servers(GP->port, GP->sockname)) ERRX("Can't run server's threads");
+    while(1);
+    //WARNX("TEST ends");
+    //signals(0);
+    return 0; // never reached
+}

Daemons/weatherdaemon_multimeteo/plugins/CMakeLists.txt

@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.20)
+
+set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR})
+
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(PLUGINS REQUIRED usefull_macros)
+
+include_directories(${PLUGINS_INCLUDE_DIRS} ..)
+link_directories(${PLUGINS_LIBRARY_DIRS})
+link_libraries(${$PLUGINS_LIBRARIES} -fPIC)
+
+set(LIBS "")
+
+if(DUMMY)
+    add_library(wsdummy SHARED dummy.c)
+    list(APPEND LIBS wsdummy)
+endif()
+
+if(FDEXAMPLE)
+    add_library(fdex SHARED fdexample.c)
+    list(APPEND LIBS fdex)
+endif()
+
+install(TARGETS ${LIBS} LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})

Daemons/weatherdaemon_multimeteo/plugins/dummy.c

@@ -0,0 +1,117 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// dummy meteostation sending data each `dt` seconds
+
+#include <pthread.h>
+#include <signal.h>
+#include <usefull_macros.h>
+
+#include "weathlib.h"
+
+#define NS (6)
+
+extern sensordata_t sensor;
+static double dt = 1.;
+
+static void (*freshdatahandler)(const struct sensordata_t* const) = NULL; // do nothing with fresh data
+static pthread_t thread;
+
+static val_t values[NS] = { // fields `name` and `comment` have no sense until value meaning is `IS_OTHER`
+    {.name = "WIND", .comment = "wind speed, m/s", .sense = VAL_OBLIGATORY, .type = VALT_FLOAT, .meaning = IS_WIND},
+    {.name = "WINDDIR", .comment = "wind direction azimuth (from south over west), deg", .sense = VAL_RECOMMENDED, .type = VALT_FLOAT, .meaning = IS_WINDDIR},
+    {.name = "EXTTEMP", .comment = "external temperature, degC", .sense = VAL_OBLIGATORY, .type = VALT_FLOAT, .meaning = IS_AMB_TEMP},
+    {.name = "PRESSURE", .comment = "atmospheric pressure, hPa", .sense = VAL_RECOMMENDED, .type = VALT_FLOAT, .meaning = IS_PRESSURE},
+    {.name = "HUMIDITY", .comment = "air relative humidity, %%", .sense = VAL_RECOMMENDED, .type = VALT_FLOAT, .meaning = IS_HUMIDITY},
+    {.name = "PRECIP", .comment = "precipitations flag (0 - no, 1 - yes)", .sense = VAL_OBLIGATORY, .type = VALT_UINT, .meaning = IS_PRECIP},
+};
+
+static void *mainthread(void _U_ *U){
+    FNAME();
+    double t0 = sl_dtime();
+    while(1){
+        float f = values[0].value.f + (drand48() - 0.5) / 2.;
+        if(f >= 0.) values[0].value.f = f;
+        f = values[1].value.f + (drand48() - 0.5) * 4.;
+        if(f > 160. && f < 200.) values[1].value.f = f;
+        f = values[2].value.f + (drand48() - 0.5) / 20.;
+        if(f > 13. && f < 21.) values[2].value.f = f;
+        f = values[3].value.f + (drand48() - 0.5) / 100.;
+        if(f > 585. && f < 615.) values[3].value.f = f;
+        f = values[4].value.f + (drand48() - 0.5) / 10.;
+        if(f > 60. && f <= 100.) values[4].value.f = f;
+        values[5].value.u = (f > 98.) ? 1 : 0;
+        time_t cur = time(NULL);
+        for(int i = 0; i < NS; ++i) values[i].time = cur;
+        if(freshdatahandler) freshdatahandler(&sensor);
+        while(sl_dtime() - t0 < dt) usleep(500);
+        t0 = sl_dtime();
+    }
+    return NULL;
+}
+
+static int init(int N, time_t pollt, int _U_ fd){
+    FNAME();
+    values[0].value.f = 1.;
+    values[1].value.f = 180.;
+    values[2].value.f = 17.;
+    values[3].value.f = 600.;
+    values[4].value.f = 80.;
+    values[5].value.u = 0;
+    if(pthread_create(&thread, NULL, mainthread, NULL)) return 0;
+    sensor.PluginNo = N;
+    if(pollt) dt = (double) pollt; // refresh each `pollt` seconds
+    return NS;
+}
+
+static int onrefresh(void (*handler)(const struct sensordata_t* const)){
+    FNAME();
+    if(!handler) return FALSE;
+    freshdatahandler = handler;
+    return TRUE;
+}
+
+static void die(){
+    FNAME();
+    if(0 == pthread_kill(thread, 9)){
+        DBG("Killed, join");
+        pthread_join(thread, NULL);
+        DBG("Done");
+    }
+}
+
+/**
+ * @brief getval - value's getter
+ * @param o (o) - value
+ * @param N - it's index
+ * @return FALSE if failed
+ */
+static int getval(val_t *o, int N){
+    if(N < 0 || N >= NS) return FALSE;
+    if(o) *o = values[N];
+    return TRUE;
+}
+
+sensordata_t sensor = {
+    .name = "Dummy weatherstation",
+    .Nvalues = NS,
+    .init = init,
+    .onrefresh = onrefresh,
+    .get_value = getval,
+    .die = die,
+};

Daemons/weatherdaemon_multimeteo/plugins/fdexample.c

@@ -0,0 +1,178 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <pthread.h>
+#include <signal.h> // pthread_kill
+#include <string.h>
+#include <time.h>
+#include <usefull_macros.h>
+
+#include "weathlib.h"
+
+// dummy example of file descriptors usage
+
+#define NS (4)
+
+static time_t Tpoll = 10;
+extern sensordata_t sensor;
+static int fdes = -1;
+static sl_ringbuffer_t *rb;
+static pthread_t thread;
+static void (*freshdatahandler)(const struct sensordata_t* const) = NULL;
+static void die();
+
+static val_t values[NS] = { // fields `name` and `comment` have no sense until value meaning is `IS_OTHER`
+    {.name = "WIND",     .sense = VAL_OBLIGATORY,  .type = VALT_FLOAT, .meaning = IS_WIND},
+    {.name = "EXTTEMP",  .sense = VAL_OBLIGATORY,  .type = VALT_FLOAT, .meaning = IS_AMB_TEMP},
+    {.name = "PRESSURE", .sense = VAL_RECOMMENDED, .type = VALT_FLOAT, .meaning = IS_PRESSURE},
+    {.name = "HUMIDITY", .sense = VAL_RECOMMENDED, .type = VALT_FLOAT, .meaning = IS_HUMIDITY},
+};
+
+static int format_values(char *buf){
+    int gotvals = 0;
+    char *token = strtok(buf, ",");
+    time_t tnow = time(NULL);
+    while(token && gotvals < NS){
+        double v;
+        DBG("TOKEN: %s", token);
+        if(sl_str2d(&v, token)){
+            DBG("next value: %g", v);
+            values[gotvals].value.f = (float) v;
+            values[gotvals].time = tnow;
+            ++gotvals;
+        }
+        token = strtok(NULL, ",");
+    }
+    DBG("GOT: %d", gotvals);
+    return gotvals;
+}
+
+static ssize_t writedata(int fd, const char *str, size_t size){
+    ssize_t sent = 0;
+    do{
+        DBG("try to write %zd bytes", size);
+        int canwrite = sl_canwrite(fd);
+        if(canwrite < 0){
+            WARNX("Disconnected?!");
+            return -1;
+        }else if(canwrite){
+            ssize_t r = write(fd, str+sent, size);
+            if(r < 0){
+                sent = -1;
+                WARNX("Disconnected??");
+                break;
+            }else{
+                sent += r;
+                size -= r;
+            }
+            DBG("sent %zd bytes; total send %zd, leave %zd", r, sent, size);
+        }
+    }while(size);
+    return sent;
+}
+
+static void *mainthread(void _U_ *U){
+    FNAME();
+    time_t task = 0;
+    const char begging[] = "Enter comma-separated data: wind, exttemp, pressure, humidity\n";
+    char buf[128];
+    while(fdes > -1){
+        time_t tnow = time(NULL);
+        int canread = sl_canread(fdes);
+        if(canread < 0){
+            WARNX("Disconnected fd %d", fdes);
+            break;
+        }else if(canread == 1){
+            ssize_t got = read(fdes, buf, 128);
+            if(got > 0){
+                sl_RB_write(rb, (uint8_t*)buf, got);
+            }else if(got < 0){
+                DBG("Disconnected?");
+                break;
+            }
+        }
+        if(sl_RB_readline(rb, buf, 127) > 0){
+            if(NS == format_values(buf) && freshdatahandler)
+                freshdatahandler(&sensor);
+        }
+        if(tnow >= task){
+            DBG("write %s", begging);
+            ssize_t got = writedata(fdes, begging, sizeof(begging)-1);
+            if(got > 0) task = tnow + Tpoll;
+            else if(got < 0){
+                close(fdes);
+                fdes = -1;
+            }
+        }
+    }
+    DBG("OOOOps!");
+    return NULL;
+}
+
+static int init(int N, time_t pollt, int fd){
+    FNAME();
+    if(!(rb = sl_RB_new(BUFSIZ))){
+        WARNX("Can't init ringbuffer!");
+        return 0;
+    }
+    if(pthread_create(&thread, NULL, mainthread, NULL)) return 0;
+    sensor.PluginNo = N;
+    if(pollt) Tpoll = pollt;
+    fdes = fd;
+    if(fdes < 0) return -1;
+    return NS;
+}
+
+static int onrefresh(void (*handler)(const struct sensordata_t* const)){
+    FNAME();
+    if(!handler) return FALSE;
+    freshdatahandler = handler;
+    return TRUE;
+}
+
+
+static int getval(val_t *o, int N){
+    if(N < 0 || N >= NS) return FALSE;
+    if(o) *o = values[N];
+    return TRUE;
+}
+
+static void die(){
+    FNAME();
+    if(0 == pthread_kill(thread, -9)){
+        DBG("Killed, join");
+        pthread_join(thread, NULL);
+        DBG("Done");
+    }
+    DBG("Delete RB");
+    sl_RB_delete(&rb);
+    if(fdes > -1){
+        close(fdes);
+        DBG("FD closed");
+    }
+    DBG("FDEXAMPLE: died");
+}
+
+sensordata_t sensor = {
+    .name = "Dummy socket or serial device weatherstation",
+    .Nvalues = NS,
+    .init = init,
+    .onrefresh = onrefresh,
+    .get_value = getval,
+    .die = die,
+};

Daemons/weatherdaemon_multimeteo/sensors.c

@@ -0,0 +1,227 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <dlfcn.h>
+#include <string.h>
+#include <usefull_macros.h>
+
+#include "fd.h"
+#include "sensors.h"
+
+#define WARNXL(...) do{ LOGWARN(__VA_ARGS__); WARNX(__VA_ARGS__); } while(0)
+#define WARNL(...) do{ LOGWARN(__VA_ARGS__); WARN(__VA_ARGS__); } while(0)
+#define ERRXL(...) do{ LOGERR(__VA_ARGS__); ERRX(__VA_ARGS__); } while(0)
+#define ERRL(...) do{ LOGERR(__VA_ARGS__); ERR(__VA_ARGS__); } while(0)
+
+// poll each `poll_interval` seconds
+static time_t poll_interval = 15;
+
+static int nplugins = 0;
+static sensordata_t **allplugins = NULL;
+
+int get_nplugins(){
+    return nplugins;
+}
+
+// set polling interval
+int set_pollT(time_t t){
+    if(t == 0 || t > MAX_POLLT) return FALSE;
+    poll_interval = t;
+    return TRUE;
+}
+
+/**
+ * @brief get_plugin - get copy of opened plugin
+ * @param o (o) - plugin with given index
+ * @param N - index in `allplugins`
+ * @return TRUE if OK
+ */
+int get_plugin(sensordata_t *o, int N){
+    if(!o || N < 0 || N >= nplugins) return FALSE;
+    *o = *allplugins[N];
+    return TRUE;
+}
+
+void *open_plugin(const char *name){
+    DBG("try to open lib %s", name);
+    void* dlh = dlopen(name, RTLD_NOLOAD); // library may be already opened
+    if(!dlh){
+        DBG("Not loaded - load");
+        dlh = dlopen(name, RTLD_NOW);
+    }
+    if(!dlh){
+        char *e = dlerror();
+        WARNXL("Can't find plugin! %s", (e) ? e : "");
+        return NULL;
+    }
+    return dlh;
+}
+
+#ifdef EBUG
+// in release this function can be used for meteo logging
+static void dumpsensors(const struct sensordata_t* const station){
+    FNAME();
+    if(!station || !station->get_value || station->Nvalues < 1) return;
+    char buf[FULL_LEN+1];
+    uint64_t Tsum = 0; int nsum = 0;
+    int N = (nplugins > 1) ? station->PluginNo : -1;
+    for(int i = 0; i < station->Nvalues; ++i){
+        val_t v;
+        if(!station->get_value(&v, i)) continue;
+        if(0 < format_sensval(&v, buf, FULL_LEN+1, N)){
+            printf("%s\n", buf);
+            ++nsum; Tsum += v.time;
+        }
+    }
+    time_t last = (time_t)(Tsum / nsum);
+    if(0 < format_msrmttm(last, buf, FULL_LEN+1)){
+        printf("%s\n\n", buf);
+    }
+}
+#endif
+
+/**
+ * @brief openplugins - open sensors' plugin and init it
+ * @param paths - paths to plugins
+ * @param N - amount of plugins
+ * @return amount of opened and inited plugins
+ * This function should be runned only once at start
+ */
+int openplugins(char **paths, int N){
+    char buf[PATH_MAX+1];
+    if(!paths || !*paths || N < 1) return 0;
+    if(allplugins || nplugins){
+        WARNXL("Plugins already opened"); return 0;
+    }
+    allplugins = MALLOC(sensordata_t*, N);
+    green("Try to open plugins:\n");
+    for(int i = 0; i < N; ++i){
+        printf("\tplugin[%d]=%s\n", i, paths[i]);
+        snprintf(buf, PATH_MAX, "%s", paths[i]);
+        char *colon = strchr(buf, ':');
+        if(colon) *colon++ = 0;
+        void* dlh = open_plugin(buf);
+        if(!dlh) continue;
+        DBG("OPENED");
+        void *s = dlsym(dlh, "sensor");
+        if(s){
+            sensordata_t *S = (sensordata_t*) s;
+            if(!S->get_value) WARNXL("Sensor library %s have no values' getter!", paths[i]);
+            if(!S->init){
+                WARNXL("Sensor library %s have no init funtion");
+                continue;
+            }
+            int fd = -1;
+            if(colon) fd = getFD(colon);
+            int ns = S->init(nplugins, poll_interval, fd); // here nplugins is index in array
+            if(ns < 1) WARNXL("Can't init plugin %s", paths[i]);
+            else{
+#ifdef EBUG
+                if(!S->onrefresh(dumpsensors)) WARNXL("Can't init refresh funtion");
+#endif
+                LOGMSG("Plugin %s nave %d sensors", paths[i], ns);
+                allplugins[nplugins++] = S;
+            }
+        }else WARNXL("Can't find field `sensor` in plugin %s: %s", paths[i], dlerror());
+    }
+    return nplugins;
+}
+
+/**
+ * @brief closeplugins - call `die` function for all sensors
+ * This function should be runned at exit
+ */
+void closeplugins(){
+    if(!allplugins || nplugins < 1) return;
+    for(int i = 0; i < nplugins; ++i){
+        if(allplugins[i]->die) allplugins[i]->die();
+    }
+    FREE(allplugins);
+    nplugins = 0;
+}
+
+/**
+ * @brief format_sensval - snprintf sensor's value into buffer
+ * @param v - value to get
+ * @param buf - buffer
+ * @param buflen - full length of `buf`
+ * @param Np - if Np>-1, show it as plugin number (added to field name in square brackets, like WIND[1]);
+ * @return amount of symbols printed or -1 if error
+ */
+int format_sensval(const val_t *v, char *buf, int buflen, int Np){
+    --buflen; // for trailing zero
+    if(!v || !buf || buflen < FULL_LEN) return -1;
+    char strval[VAL_LEN+1];
+    switch(v->type){
+        case VALT_UINT:  snprintf(strval, VAL_LEN, "%u", v->value.u); break;
+        case VALT_INT:   snprintf(strval, VAL_LEN, "%d", v->value.i); break;
+        case VALT_FLOAT: snprintf(strval, VAL_LEN, "%g", v->value.f); break;
+        default: sprintf(strval, "'ERROR'");
+    }
+    const char* const NM[] = { // names of standard fields
+        [IS_WIND]       = "WIND",
+        [IS_WINDDIR]    = "WINDDIR",
+        [IS_HUMIDITY]   = "HUMIDITY",
+        [IS_AMB_TEMP]   = "EXTTEMP",
+        [IS_INNER_TEMP] = "INTTEMP",
+        [IS_HW_TEMP]    = "HWTEMP", // mirror?
+        [IS_PRESSURE]   = "PRESSURE",
+        [IS_PRECIP]     = "PRECIP",
+        [IS_PRECIP_LEVEL]="PRECIPLV",
+        [IS_MIST]       = "MIST",
+        [IS_CLOUDS]     = "CLOUDS",
+        [IS_SKYTEMP]    = "SKYTEMP"
+    };
+    const char* const CMT[] = { // comments for standard fields
+        [IS_WIND]       = "Wind, m/s",
+        [IS_WINDDIR]    = "Wind direction, degr (CW from north to FROM)",
+        [IS_HUMIDITY]   = "Humidity, percent",
+        [IS_AMB_TEMP]   = "Ambient temperature, degC",
+        [IS_INNER_TEMP] = "In-dome temperature, degC",
+        [IS_HW_TEMP]    = "Hardware (mirror?) termperature, degC",
+        [IS_PRESSURE]   = "Atmospheric pressure, mmHg",
+        [IS_PRECIP]     = "Precipitation (1 - yes, 0 - no)",
+        [IS_PRECIP_LEVEL]="Precipitation level (mm)",
+        [IS_MIST]       = "Mist (1 - yes, 0 - no)",
+        [IS_CLOUDS]     = "Integral clouds value (bigger - better)",
+        [IS_SKYTEMP]    = "Mean sky temperatyre"
+    };
+    const char *name = NULL, *comment = NULL;
+    int idx = v->meaning;
+    if(idx < IS_OTHER){
+        name = NM[idx];
+        comment = CMT[idx];
+    }else{
+        name = v->name;
+        comment = v->comment;
+    }
+    int got;
+    if(Np > -1) got = snprintf(buf, buflen, "%s[%d]=%s / %s", name, Np, strval, comment);
+    else got = snprintf(buf, buflen, "%s=%s / %s", name, strval, comment);
+    return got;
+}
+
+// the same for measurement time formatting
+int format_msrmttm(time_t t, char *buf, int buflen){
+    --buflen; // for trailing zero
+    if(!buf || buflen < FULL_LEN) return -1;
+    char cmt[COMMENT_LEN+1];
+    struct tm *T = localtime(&t);
+    strftime(cmt, COMMENT_LEN, "%F %T", T);
+    return snprintf(buf, buflen, "TMEAS=%zd / Last measurement time: %s", t, cmt);
+}

Daemons/weatherdaemon_multimeteo/sensors.h

@@ -0,0 +1,32 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "weathlib.h"
+
+// don't allow to set polling time more than 10 minutes
+#define MAX_POLLT   (600)
+
+int openplugins(char **paths, int N);
+void closeplugins();
+int get_plugin(sensordata_t *o, int N);
+int get_nplugins();
+int format_sensval(const val_t *v, char *buf, int buflen, int Np);
+int format_msrmttm(time_t t, char *buf, int buflen);
+int set_pollT(time_t t);

Daemons/weatherdaemon_multimeteo/server.c

@@ -0,0 +1,229 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <signal.h>
+#include <string.h>
+#include <usefull_macros.h>
+
+#include "sensors.h"
+#include "server.h"
+
+// if measurement time oldest than now minus `oldest_interval`, we think measurement are too old
+static time_t oldest_interval = 60;
+
+// server's sockets: net and local (UNIX)
+static sl_sock_t *netsocket = NULL, *localsocket;
+//static pthread_t netthread, locthread;
+
+// show user current time
+static sl_sock_hresult_e timehandler(sl_sock_t *client, _U_ sl_sock_hitem_t *item, _U_ const char *req){
+    if(!client) return RESULT_FAIL;
+    char buf[32];
+    snprintf(buf, 31, "UNIXT=%.3f\n", sl_dtime());
+    sl_sock_sendstrmessage(client, buf);
+    return RESULT_SILENCE;
+}
+
+// show all connected libraries
+static sl_sock_hresult_e listhandler(sl_sock_t *client, _U_ sl_sock_hitem_t *item, _U_ const char *req){
+    if(!client) return RESULT_FAIL;
+    char buf[256];
+    int N = get_nplugins();
+    if(N < 1) return RESULT_FAIL;
+    sensordata_t d;
+    for(int i = 0; i < N; ++i){
+        if(!get_plugin(&d, i)) continue;
+        snprintf(buf, 255, "PLUGIN[%d]=%s\nNVALUES[%d]=%d\n", i, d.name, i, d.Nvalues);
+        sl_sock_sendstrmessage(client, buf);
+    }
+    return RESULT_SILENCE;
+}
+
+/**
+ * @brief showdata - send to user meteodata
+ * @param client - client data
+ * @param N - index of station
+ * @param showidx - == TRUE to show index in square brackets
+ */
+static void showdata(sl_sock_t *client, int N, int showidx){
+    char buf[FULL_LEN+1];
+    val_t v;
+    sensordata_t s;
+    if(!get_plugin(&s, N) || (s.Nvalues < 1)){
+        snprintf(buf, FULL_LEN, "Can't get plugin[%d]\n", N);
+        sl_sock_sendstrmessage(client, buf);
+        return;
+    }
+    if(!showidx || get_nplugins() == 1) N = -1; // only one -> don't show indexes
+    time_t oldest = time(NULL) - oldest_interval;
+    uint64_t Tsum = 0; int nsum = 0;
+    for(int i = 0; i < s.Nvalues; ++i){
+        if(!s.get_value(&v, i)) continue;
+        if(v.time < oldest) continue;
+        if(1 > format_sensval(&v, buf, FULL_LEN+1, N)) continue;
+        DBG("formatted: '%s'", buf);
+        sl_sock_sendstrmessage(client, buf);
+        sl_sock_sendbyte(client, '\n');
+        ++nsum; Tsum += v.time;
+    }
+    oldest = (time_t)(Tsum / nsum);
+    if(0 < format_msrmttm(oldest, buf, FULL_LEN+1)){ // send mean measuring time
+        DBG("Formatted time: '%s'", buf);
+        sl_sock_sendstrmessage(client, buf);
+        sl_sock_sendbyte(client, '\n');
+    }
+}
+
+// get meteo data
+static sl_sock_hresult_e gethandler(sl_sock_t *client, _U_ sl_sock_hitem_t *item, const char *req){
+    if(!client) return RESULT_FAIL;
+    int N = get_nplugins();
+    if(N < 1) return RESULT_FAIL;
+    if(!req) for(int i = 0; i < N; ++i) showdata(client, i, TRUE);
+    else{
+        int n;
+        if(!sl_str2i(&n, req) || n < 0 || n >= N) return RESULT_BADVAL;
+        showdata(client, n, FALSE);
+    }
+    return RESULT_SILENCE;
+}
+
+// graceful closing socket: let client know that he's told to fuck off
+static void toomuch(int fd){
+    const char *m = "Try later: too much clients connected\n";
+    send(fd, m, sizeof(m)-1, MSG_NOSIGNAL);
+    shutdown(fd, SHUT_WR);
+    DBG("shutdown, wait");
+    double t0 = sl_dtime();
+    uint8_t buf[8];
+    while(sl_dtime() - t0 < 90.){ // change this value to smaller for real work
+        if(sl_canread(fd)){
+            ssize_t got = read(fd, buf, 8);
+            DBG("Got=%zd", got);
+            if(got < 1) break;
+        }
+    }
+    DBG("Disc after %gs", sl_dtime() - t0);
+    LOGWARN("Client fd=%d tried to connect after MAX reached", fd);
+}
+// new connections handler (return FALSE to reject client)
+static int connected(sl_sock_t *c){
+    if(c->type == SOCKT_UNIX) LOGMSG("New local client fd=%d connected", c->fd);
+    else LOGMSG("New client fd=%d, IP=%s connected", c->fd, c->IP);
+    return TRUE;
+}
+// disconnected handler
+static void disconnected(sl_sock_t *c){
+    if(c->type == SOCKT_UNIX) LOGMSG("Disconnected local client fd=%d", c->fd);
+    else LOGMSG("Disconnected client fd=%d, IP=%s", c->fd, c->IP);
+}
+static sl_sock_hresult_e defhandler(struct sl_sock *s, const char *str){
+    if(!s || !str) return RESULT_FAIL;
+    sl_sock_sendstrmessage(s, "You entered wrong command:\n```\n");
+    sl_sock_sendstrmessage(s, str);
+    sl_sock_sendstrmessage(s, "\n```\nTry \"help\"\n");
+    return RESULT_SILENCE;
+}
+
+// handlers for network and local (UNIX) sockets
+static sl_sock_hitem_t nethandlers[] = { // net - only getters and client-only setters
+    {gethandler,  "get",  "get all meteo or only for given plugin number", NULL},
+    {listhandler, "list", "show all opened plugins", NULL},
+    {timehandler, "time", "get server's UNIX time", NULL},
+    {NULL, NULL, NULL, NULL}
+};
+static sl_sock_hitem_t localhandlers[] = { // local - full amount of setters/getters
+    {gethandler,  "get",  "get all meteo or only for given plugin number", NULL},
+    {listhandler, "list", "show all opened plugins", NULL},
+    {timehandler, "time", "get server's UNIX time", NULL},
+    {NULL, NULL, NULL, NULL}
+};
+
+#if 0
+// common parsers for both net and local sockets
+static void *cmdparser(void *U){
+    if(!U) return NULL;
+    sl_sock_t *s = (sl_sock_t*) U;
+    while(s && s->connected){
+        if(!s->rthread){
+            LOGERR("Server's handlers' thread is dead");
+            break;
+        }
+    }
+    LOGDBG("cmdparser(): exit");
+    return NULL;
+}
+#endif
+
+int start_servers(const char *netnode, const char *sockpath){
+    if(!netnode || !sockpath){
+        LOGERR("start_servers(): need arguments");
+        return FALSE;
+    }
+    netsocket = sl_sock_run_server(SOCKT_NET, netnode, BUFSIZ, nethandlers);
+    if(!netsocket){
+        LOGERR("start_servers(): can't run network socket");
+        return FALSE;
+    }
+    localsocket = sl_sock_run_server(SOCKT_UNIX, sockpath, BUFSIZ, localhandlers);
+    if(!localsocket){
+        LOGERR("start_servers(): can't run local socket");
+        return FALSE;
+    }
+    sl_sock_changemaxclients(netsocket, MAX_CLIENTS);
+    sl_sock_changemaxclients(localsocket, 1);
+    sl_sock_maxclhandler(netsocket, toomuch);
+    sl_sock_maxclhandler(localsocket, toomuch);
+    sl_sock_connhandler(netsocket, connected);
+    sl_sock_connhandler(localsocket, connected);
+    sl_sock_dischandler(netsocket, disconnected);
+    sl_sock_dischandler(localsocket, disconnected);
+    sl_sock_defmsghandler(netsocket, defhandler);
+    sl_sock_defmsghandler(localsocket, defhandler);
+#if 0
+    if(pthread_create(&netthread, NULL, cmdparser, (void*)netsocket)){
+        LOGERR("Can't run server's net thread");
+        goto errs;
+    }
+    if(pthread_create(&locthread, NULL, cmdparser, (void*)localsocket)){
+        LOGERR("Can't run server's local thread");
+        goto errs;
+    }
+#endif
+    return TRUE;
+#if 0
+errs:
+    sl_sock_delete(&localsocket);
+    sl_sock_delete(&netsocket);
+    return FALSE;
+#endif
+}
+
+void kill_servers(){
+    //pthread_cancel(locthread);
+    //pthread_cancel(netthread);
+    //LOGMSG("Server threads canceled");
+    //usleep(500);
+    sl_sock_delete(&localsocket);
+    sl_sock_delete(&netsocket);
+    LOGMSG("Server sockets destroyed");
+    //usleep(500);
+    //pthread_kill(locthread, 9);
+    //pthread_kill(netthread, 9);
+    //LOGMSG("Server threads killed");
+}

Daemons/weatherdaemon_multimeteo/server.h

@@ -0,0 +1,25 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+// maximal amount of simultaneous clients connected
+#define MAX_CLIENTS     (30)
+
+int start_servers(const char *netnode, const char *sockpath);
+void kill_servers();

Daemons/weatherdaemon_multimeteo/weatherdaemon.cflags

@@ -0,0 +1 @@
+-std=c17

Daemons/weatherdaemon_multimeteo/weatherdaemon.config

@@ -0,0 +1,4 @@
+#define EBUG       1
+#define _GNU_SOURCE
+#define _XOPEN_SOURCE 1111
+#define _POSIX_C_SOURCE 200000

Daemons/weatherdaemon_multimeteo/weatherdaemon.creator

@@ -0,0 +1 @@
+[General]

Daemons/weatherdaemon_multimeteo/weatherdaemon.cxxflags

@@ -0,0 +1 @@
+-std=c++17

Daemons/weatherdaemon_multimeteo/weatherdaemon.files

@@ -0,0 +1,9 @@
+cmdlnopts.c
+cmdlnopts.h
+main.c
+plugins/dummy.c
+sensors.c
+sensors.h
+server.c
+server.h
+weathlib.h

Daemons/weatherdaemon_multimeteo/weatherdaemon.includes

@@ -0,0 +1 @@
+.

Daemons/weatherdaemon_multimeteo/weathlib.h

@@ -0,0 +1,92 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <time.h>
+
+// length (in symbols) of key, value and comment
+#define KEY_LEN         (8)
+#define VAL_LEN         (31)
+#define COMMENT_LEN     (63)
+// maximal full length of "KEY=val / comment" (as for sfitsio)
+#define FULL_LEN        (81)
+// name of meteo-plugin
+#define NAME_LEN        (127)
+
+// importance of values
+typedef enum{
+    VAL_OBLIGATORY,     // can't be omitted
+    VAL_RECOMMENDED,    // recommended to show
+    VAL_UNNECESSARY,    // may be shown by user request
+    VAL_BROKEN          // sensor is broken, omit it
+} valsense_t;
+
+// meaning of values
+typedef enum{
+    IS_WIND,            // wind, m/s
+    IS_WINDDIR,         // wind direction, degr
+    IS_HUMIDITY,        // humidity, percent
+    IS_AMB_TEMP,        // ambient temperature, degC
+    IS_INNER_TEMP,      // in-dome temperature, degC
+    IS_HW_TEMP,         // hardware (?) termperature, degC
+    IS_PRESSURE,        // atmospheric pressure, mmHg
+    IS_PRECIP,          // precipitation (1 - yes, 0 - no)
+    IS_PRECIP_LEVEL,    // precipitation level (mm)
+    IS_MIST,            // mist (1 - yes, 0 - no)
+    IS_CLOUDS,          // integral clouds value (bigger - better)
+    IS_SKYTEMP,         // mean sky temperatyre
+    IS_OTHER            // something other - read "name" and "comment"
+} valmeaning_t;
+
+typedef union{
+    uint32_t u;
+    int32_t i;
+    float f;
+} num_t;
+
+// type of value
+typedef enum{
+    VALT_UINT,
+    VALT_INT,
+    VALT_FLOAT,
+    //VALT_STRING,
+} valtype_t;
+
+// value
+typedef struct{
+    char name[KEY_LEN+1];   // max VAL_LEN symbols FITS header keyword name
+    char comment[COMMENT_LEN+1];// max COMMENT_LEN symbols of comment to FITS header
+    valsense_t sense;       // importance
+    valtype_t type;         // type of given value
+    valmeaning_t meaning;   // what type of sensor is it
+    num_t value;            // value itself
+    time_t time;            // last changing time
+} val_t;
+
+// all sensor's data
+typedef struct sensordata_t{
+    char name[NAME_LEN+1];  // max 31 symbol of sensor's name (e.g. "rain sensor")
+    int Nvalues;            // amount of values
+    int PluginNo;           // plugin number in array (if several)
+    int (*init)(int, time_t, int); // init meteostation with given PluginNo, poll_interval and fd; return amount of parameters found
+    int (*onrefresh)(void (*handler)(const struct sensordata_t* const)); // handler of new data; return TRUE if OK
+    int (*get_value)(val_t *, int); // getter of Nth value
+    void (*die)();          // close everything and die
+} sensordata_t;