Change netdaemon to poll & work with libusefull_macros, add weatherdaemon

Daemons/weatherdaemon/term.c

@@ -0,0 +1,168 @@
+/*
+ * This file is part of the weatherdaemon project.
+ * Copyright 2021 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 <ctype.h>  // isspace
+#include <stdio.h>
+#include <string.h>
+#include <strings.h> // strncasecmp
+#include <time.h>    // time(NULL)
+#include <limits.h>  // INT_MAX, INT_MIN
+#include "term.h"
+#include "cmdlnopts.h"
+
+#define BUFLEN 1024
+
+TTY_descr *ttydescr = NULL;
+extern glob_pars *GP;
+
+static char buf[BUFLEN];
+static const char *emultemplate = "<?U> 06:50:36, 20.01.00, TE-2.20, DR1405.50, WU2057.68, RT0.00, WK1.00, WR177.80, WT-2.20, FE0.69, RE0.00, WG7.36, WV260.03, TI0.00, FI0.00,";
+
+/**
+ * read strings from terminal (ending with '\n') with timeout
+ * @return NULL if nothing was read or pointer to static buffer
+ */
+static char *read_string(){
+    //static int done = 0;
+    if(GP->emul){
+        //if(done) return NULL;
+        strncpy(buf, emultemplate, BUFLEN);
+        //done = 1;
+        return buf;
+    }
+    if(!ttydescr) ERRX("Serial device not initialized");
+    size_t r = 0, l;
+    int LL = BUFLEN - 1;
+    char *ptr = buf;
+    double d0 = dtime();
+    do{
+        if((l = read_tty(ttydescr))){
+            r += l; LL -= l; ptr += l;
+            d0 = dtime();
+        }
+    }while(dtime() - d0 < WAIT_TMOUT && LL);
+    if(r){
+        buf[r] = 0;
+        return buf;
+    }
+    return NULL;
+}
+
+/**
+ * Try to connect to `device` at baudrate speed
+ * @return 1 if OK
+ */
+int try_connect(char *device, int baudrate){
+    if(!device) return 0;
+    fflush(stdout);
+    ttydescr = new_tty(device, baudrate, 1024);
+    if(ttydescr) ttydescr = tty_open(ttydescr, 1); // exclusive open
+    if(!ttydescr) return 0;
+    while(read_tty(ttydescr)); // clear rbuf
+    LOGMSG("Connected to %s", device);
+    return 1;
+}
+
+/**
+ * @brief getpar - get parameter value
+ * @param string (i) - string where to search
+ * @param Val (o)    - value found
+ * @param Name       - parameter name
+ * @return 0 if found
+ */
+static int getpar(char *string, double *Val, char *Name){
+    char *p = strstr(string, Name);
+    if(!p) return 1;
+    p += strlen(Name);
+    DBG("search %s", Name);
+    if(!Val) return 0;
+    char *endptr;
+    *Val = strtod(p, &endptr);
+    DBG("eptr=%s, val=%g", endptr, *Val);
+    if(endptr == string){
+        WARNX("Double value not found");
+        return 2;
+    }
+    return 0;
+}
+
+
+/**
+ * Poll serial port for new dataportion
+ * @return: NULL if no data received, pointer to string if valid data received
+ */
+char *poll_device(){
+    static char ans[BUFLEN];
+    char *ptr = ans, *r = NULL;
+    if(!GP->emul){
+        if(write_tty(ttydescr->comfd, "?U\r\n", 4))
+            return NULL;
+    }
+    double t0 = dtime();
+    while(dtime() - t0 < T_POLLING_TMOUT){
+        if((r = read_string())){ // parse new data
+            DBG("got %s", r);
+            if(strncmp(r, "<?U>", 4)){
+                WARNX("Wrong answer");
+                LOGWARN("poll_device() get wrong answer: %s", r);
+                return NULL;
+            }
+            r += 4;
+            DBG("R=%s", r);
+            while(*r){if(isspace(*r)) ++r; else break;}
+            DBG("R=%s", r);
+            char *eol = strchr(r, '\n');
+            if(eol) *eol = 0;
+            double d;
+            size_t L = BUFLEN, l;
+            if(!getpar(r, &d, "RT")){
+                l = snprintf(ptr, L, "Rain=%g\n", d);
+                if(l > 0){
+                    L -= l;
+                    ptr += l;
+                }
+            }
+            if(!getpar(r, &d, "WU")){
+                l = snprintf(ptr, L, "Clouds=%g\n", d);
+                if(l > 0){
+                    L -= l;
+                    ptr += l;
+                }
+            }
+            if(!getpar(r, &d, "TE")){
+                l = snprintf(ptr, L, "Exttemp=%g\n", d);
+                if(l > 0){
+                    L -= l;
+                    ptr += l;
+                }
+            }
+            if(!getpar(r, &d, "WG")){
+                l = snprintf(ptr, L, "Wind=%g\n", d/3.6);
+                if(l > 0){
+                    L -= l;
+                    ptr += l;
+                }
+            }
+            snprintf(ptr, L, "Time=%lld\n", (long long)time(NULL));
+            DBG("Buffer: %s", ans);
+            return ans;
+        }
+    }
+    return NULL;
+}
+