add simplest modbus relay management

modbus_relay/Makefile

@@ -0,0 +1,59 @@
+# run `make DEF=...` to add extra defines
+PROGRAM := modbus_relay
+LDFLAGS := -fdata-sections -ffunction-sections -Wl,--gc-sections -Wl,--discard-all
+LDFLAGS += -lusefull_macros -lmodbus
+SRCS := $(wildcard *.c)
+DEFINES := $(DEF) -D_GNU_SOURCE -D_XOPEN_SOURCE=1111
+OBJDIR := mk
+CFLAGS += -O2 -Wall -Wextra -Wno-trampolines
+OBJS := $(addprefix $(OBJDIR)/, $(SRCS:%.c=%.o))
+DEPS := $(OBJS:.o=.d)
+TARGFILE := $(OBJDIR)/TARGET
+CC = gcc
+#TARGET := RELEASE
+
+ifeq ($(shell test -e $(TARGFILE) && echo -n yes),yes)
+	TARGET := $(file < $(TARGFILE))
+else
+	TARGET := RELEASE
+endif
+
+ifeq ($(TARGET), DEBUG)
+	.DEFAULT_GOAL := debug
+endif
+
+release: CFLAGS += -flto
+release: LDFLAGS += -flto
+release: $(PROGRAM)
+
+debug: CFLAGS += -DEBUG -Werror
+debug: TARGET := DEBUG
+debug: $(PROGRAM)
+
+$(TARGFILE): $(OBJDIR)
+	@echo -e "\t\tTARGET: $(TARGET)"
+	@echo "$(TARGET)" > $(TARGFILE)
+
+$(PROGRAM) : $(TARGFILE) $(OBJS)
+	@echo -e "\t\tLD $(PROGRAM)"
+	$(CC) $(LDFLAGS) $(OBJS) -o $(PROGRAM)
+
+$(OBJDIR):
+	@mkdir $(OBJDIR)
+
+ifneq ($(MAKECMDGOALS),clean)
+-include $(DEPS)
+endif
+
+$(OBJDIR)/%.o: %.c
+	@echo -e "\t\tCC $<"
+	$(CC) -MD -c $(LDFLAGS) $(CFLAGS) $(DEFINES) -o $@ $<
+
+clean:
+	@echo -e "\t\tCLEAN"
+	@rm -rf $(OBJDIR) 2>/dev/null || true
+
+xclean: clean
+	@rm -f $(PROGRAM)
+
+.PHONY: clean xclean

modbus_relay/cmdlnopts.c

@@ -0,0 +1,89 @@
+/*                                                                                                  geany_encoding=koi8-r
+ * cmdlnopts.c - the only function that parse cmdln args and returns glob parameters
+ *
+ * Copyright 2013 Edward V. Emelianoff <eddy@sao.ru>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+#include <assert.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <strings.h>
+#include "cmdlnopts.h"
+#include "usefull_macros.h"
+
+/*
+ * here are global parameters initialisation
+ */
+static int help;
+sl_loglevel_e verblvl = LOGLEVEL_WARN;
+
+glob_pars GP = {
+    .baudrate = 9600,
+    .device = "/dev/ttyUSB0",
+    .nodenum = 1,
+};
+
+/*
+ * Define command line options by filling structure:
+ *  name        has_arg     flag    val     type        argptr              help
+*/
+static sl_option_t cmdlnopts[] = {
+    {"help",    NO_ARGS,    NULL,   'h',    arg_int,    APTR(&help),        "show this help"},
+    {"verbose", NO_ARGS,    NULL,   'v',    arg_none,   APTR(&GP.verbose),  "verbose level for (each `-v` increase it)"},
+    {"logfile", NEED_ARG,   NULL,   'l',    arg_string, APTR(&GP.logfile),  "logging file name"},
+    {"baudrate",NEED_ARG,   NULL,   'b',    arg_int,    APTR(&GP.baudrate), "interface baudrate (default: 9600)"},
+    {"device",  NEED_ARG,   NULL,   'd',    arg_string, APTR(&GP.device),   "serial device path (default: /dev/ttyUSB0)"},
+    {"set",     MULT_PAR,   NULL,   's',    arg_int,    APTR(&GP.setrelay), "set Nth relay"},
+    {"reset",   MULT_PAR,   NULL,   'r',    arg_int,    APTR(&GP.resetrelay),"reset Nth relay"},
+    {"input",   MULT_PAR,   NULL,   'i',    arg_int,    APTR(&GP.getinput), "read Nth input"},
+    {"get",     MULT_PAR,   NULL,   'g',    arg_int,    APTR(&GP.getrelay), "reat Nth relay"},
+    {"setall",  NO_ARGS,    NULL,   'S',    arg_int,    APTR(&GP.setall),   "set all relays"},
+    {"resetall",NO_ARGS,    NULL,   'R',    arg_int,    APTR(&GP.resetall), "reset all relays"},
+    {"node",    NEED_ARG,   NULL,   'n',    arg_int,    APTR(&GP.nodenum),  "node number (default: 1)"},
+    {"readN",   NO_ARGS,    NULL,   0,      arg_int,    APTR(&GP.readn),    "read node number"},
+    {"setN",    NEED_ARG,   NULL,   0,      arg_int,    APTR(&GP.setn),     "change node number"},
+    end_option
+};
+
+/**
+ * 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
+ */
+void parse_args(int argc, char **argv){
+    size_t hlen = 1024;
+    char helpstring[1024], *hptr = helpstring;
+    snprintf(hptr, hlen, "Usage: %%s [args]\n\n\tWhere args are:\n");
+    // format of help: "Usage: progname [args]\n"
+    sl_helpstring(helpstring);
+    // parse arguments
+    sl_parseargs(&argc, &argv, cmdlnopts);
+    if(help) sl_showhelp(-1, cmdlnopts);
+    if(argc > 0) WARNX("Omit %d unexpected arguments", argc);
+}
+
+void verbose(sl_loglevel_e lvl, const char *fmt, ...){
+    if(lvl > verblvl) return;
+    va_list ar;
+    va_start(ar, fmt);
+    vprintf(fmt, ar);
+    va_end(ar);
+    fflush(stdout);
+}

modbus_relay/cmdlnopts.h

@@ -0,0 +1,49 @@
+/*
+ * This file is part of the modbus_relay 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 <usefull_macros.h>
+
+/*
+ * here are some typedef's for global data
+ */
+typedef struct{
+    int verbose;        // verbose level
+    int baudrate;       // interface baudrate (default: 9600)
+    int setall;         // set all relays
+    int resetall;       // reset all relays
+    int nodenum;        // node number (default: 1)
+    int readn;          // read node number
+    int setn;           // set node number
+    int **setrelay;     // set relay number N
+    int **resetrelay;   // reset relay number N
+    int **getinput;     // read Nth input
+    int **getrelay;     // read Nth relay
+    char *logfile;      // logfile name
+    char *device;       // serial device path (default: /dev/ttyUSB0)
+} glob_pars;
+
+extern glob_pars  GP;
+extern sl_loglevel_e verblvl;
+void parse_args(int argc, char **argv);
+void verbose(sl_loglevel_e lvl, const char *fmt, ...);
+
+#define VMSG(...)   verbose(LOGLEVEL_MSG, __VA_ARGS__)
+#define VDBG(...)   verbose(LOGLEVEL_DBG, __VA_ARGS__)
+#define VANY(...)   verbose(LOGLEVEL_ANY, __VA_ARGS__)

modbus_relay/main.c

@@ -0,0 +1,120 @@
+/*
+ * This file is part of the modbus_relay 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 <modbus/modbus.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "cmdlnopts.h"
+
+static void getN(modbus_t *ctx){
+    uint16_t nodeN;
+    int s = modbus_get_slave(ctx);
+    VDBG("Old node num: %d\n", s);
+    if(modbus_set_slave(ctx, 0)) ERRX("Can't set modbus slave");
+    printf("now slave id=%d\n", modbus_get_slave(ctx));
+    if(modbus_read_registers(ctx, 0, 1, &nodeN) < 0) WARNX("Can't read node number");
+    if(modbus_set_slave(ctx, s)) ERRX("Can't set modbus slave");
+    else printf("NODENUM=%u\n", nodeN);
+    printf("now slave id=%d\n", modbus_get_slave(ctx));
+}
+
+int main(int argc, char **argv){
+    sl_init();
+    parse_args(argc, argv);
+    verblvl = GP.verbose + LOGLEVEL_WARN;
+    if(verblvl >= LOGLEVEL_AMOUNT) verblvl = LOGLEVEL_AMOUNT - 1;
+    if(GP.logfile) OPENLOG(GP.logfile, verblvl, 1);
+    LOGMSG("Started");
+    VMSG("Try to open %s @%d ... ", GP.device, GP.baudrate);
+    modbus_t *ctx = modbus_new_rtu(GP.device, GP.baudrate, 'N', 8, 1);
+    modbus_set_response_timeout(ctx, 0, 100000);
+    if(modbus_set_slave(ctx, GP.nodenum)) ERRX("Can't set modbus slave");
+    if(modbus_connect(ctx) < 0) ERR("Can't open device %s", GP.device);
+    VMSG("OK!\n");
+    uint8_t dest8[8] = {0};
+    if(GP.setall){
+        memset(dest8, 1, 8);
+        if(modbus_write_bits(ctx, 0, 8, dest8) < 0) WARNX("Can't set all relays");
+    }else if(GP.resetall){
+        if(modbus_write_bits(ctx, 0, 8, dest8) < 0) WARNX("Can't clear all relays");
+    }else{
+        if(GP.resetrelay){
+            int **p = GP.resetrelay;
+            while(*p){
+                int n = **p;
+                if(n > 7 || n < 0) WARNX("Relay number should be in [0, 7]");
+                else{
+                    if(modbus_write_bit(ctx, n, 0) < 0) WARNX("Can't reset relay #%d", n);
+                    else VMSG("RELAY%d=0\n", n);
+                }
+                ++p;
+            }
+        }
+        if(GP.setrelay){
+            int **p = GP.setrelay;
+            while(*p){
+                int n = **p;
+                if(n > 7 || n < 0) WARNX("Relay number should be in [0, 7]");
+                else{
+                    if(modbus_write_bit(ctx, n, 1) < 0) WARNX("Can't set relay #%d", n);
+                    else VMSG("RELAY%d=1\n", n);
+                }
+                ++p;
+            }
+        }
+    }
+    if(GP.getinput){
+        if(modbus_read_input_bits(ctx, 0, 8, dest8) < 0) WARNX("Can't read inputs");
+        else{
+            int **p = GP.getinput;
+            while(*p){
+                int n = **p;
+                if(n > 7 || n < 0) WARNX("Input number should be in [0, 7]");
+                else printf("INPUT%d=%u\n", n, dest8[n]);
+                ++p;
+            }
+        }
+    }
+    if(GP.getrelay){
+        if(modbus_read_bits(ctx, 0, 8, dest8) < 0) WARNX("Can't read relays");
+        else{
+            int **p = GP.getrelay;
+            while(*p){
+                int n = **p;
+                if(n > 7 || n < 0) WARNX("Relay number should be in [0, 7]");
+                else printf("RELAY%d=%u\n", n, dest8[n]);
+                ++p;
+            }
+        }
+    }
+    if(GP.readn){
+        getN(ctx);
+    }
+    if(GP.setn){
+        uint16_t nodeN = (uint16_t) GP.setn;
+        modbus_write_registers(ctx, 0, 1, &nodeN);
+        modbus_set_slave(ctx, nodeN);
+        getN(ctx);
+    }
+    LOGMSG("End");
+    VMSG("End\n");
+    modbus_close(ctx);
+    modbus_free(ctx);
+    return 0;
+}

modbus_relay/modbus_relay.cflags

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

modbus_relay/modbus_relay.config

@@ -0,0 +1,2 @@
+// Add predefined macros for your project here. For example:
+// #define THE_ANSWER 42

modbus_relay/modbus_relay.creator

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

modbus_relay/modbus_relay.creator.user

@@ -0,0 +1,184 @@
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+    <value type="QList&lt;int&gt;" key="Analyzer.Valgrind.VisibleErrorKinds"></value>
+    <valuelist type="QVariantList" key="CustomOutputParsers"/>
+    <value type="int" key="PE.EnvironmentAspect.Base">2</value>
+    <valuelist type="QVariantList" key="PE.EnvironmentAspect.Changes"/>
+    <value type="bool" key="PE.EnvironmentAspect.PrintOnRun">false</value>
+    <value type="QString" key="PerfRecordArgsId">-e cpu-cycles --call-graph dwarf,4096 -F 250</value>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName"></value>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.CustomExecutableRunConfiguration</value>
+    <value type="QString" key="ProjectExplorer.RunConfiguration.BuildKey"></value>
+    <value type="bool" key="ProjectExplorer.RunConfiguration.Customized">false</value>
+    <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>
+    <value type="bool" key="RunConfiguration.UseQmlDebuggerAuto">true</value>
+   </valuemap>
+   <value type="qlonglong" key="ProjectExplorer.Target.RunConfigurationCount">1</value>
+  </valuemap>
+ </data>
+ <data>
+  <variable>ProjectExplorer.Project.TargetCount</variable>
+  <value type="qlonglong">1</value>
+ </data>
+ <data>
+  <variable>ProjectExplorer.Project.Updater.FileVersion</variable>
+  <value type="int">22</value>
+ </data>
+ <data>
+  <variable>Version</variable>
+  <value type="int">22</value>
+ </data>
+</qtcreator>

modbus_relay/modbus_relay.cxxflags

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

modbus_relay/modbus_relay.files

@@ -0,0 +1,3 @@
+cmdlnopts.c
+cmdlnopts.h
+main.c