Sun, 18 May 2014 22:56:43 +0200
Initial server code added
1 | 1 | /***************************************************************************** |
2 | * Copyright (C) 2014 | |
3 | * | |
4 | * Michiel Broek <mbroek at mbse dot eu> | |
5 | * | |
6 | * This file is part of the mbsePi-apps | |
7 | * | |
8 | * This is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2, or (at your option) any | |
11 | * later version. | |
12 | * | |
13 | * mbsePi-apps is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with EC-65K; see the file COPYING. If not, write to the Free | |
20 | * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
21 | *****************************************************************************/ | |
22 | ||
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23 | #include "../lib/mbselib.h" |
1 | 24 | #include "main.h" |
25 | ||
26 | ||
6 | 27 | #define STATUS_CONNECTING 0 |
28 | #define STATUS_CONNACK_RECVD 1 | |
29 | #define STATUS_WAITING 2 | |
30 | ||
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31 | /* Global variables for use in callbacks. */ |
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32 | static int qos = 0; |
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33 | static int status = STATUS_CONNECTING; |
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34 | static int mid_sent = 0; |
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35 | static int last_mid = -1; |
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36 | static int last_mid_sent = -1; |
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37 | static bool connected = true; |
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38 | static bool disconnect_sent = false; |
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39 | static bool connect_lost = false; |
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40 | static bool my_shutdown = false; |
12 | 41 | static pid_t pgrp, mypid; |
6 | 42 | |
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43 | extern bool debug; |
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44 | extern sys_config Config; |
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45 | #ifdef HAVE_WIRINGPI_H |
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46 | extern int lcdHandle; |
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47 | #endif |
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48 | |
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49 | int server(void); |
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50 | void help(void); |
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51 | void die(int); |
6 | 52 | |
53 | ||
1 | 54 | void help(void) |
55 | { | |
12 | 56 | fprintf(stdout, "mbsePi-apps thermometers v%s starting\n\n", VERSION); |
1 | 57 | fprintf(stdout, "Usage: thermomeneters [-d] [-h]\n"); |
12 | 58 | fprintf(stdout, " -d --debug Debug and run in foreground\n"); |
1 | 59 | fprintf(stdout, " -h --help Display this help\n"); |
60 | } | |
61 | ||
62 | ||
63 | ||
64 | void die(int onsig) | |
65 | { | |
66 | switch (onsig) { | |
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67 | case SIGHUP: syslog(LOG_NOTICE, "Got SIGHUP, shutting down"); |
1 | 68 | break; |
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69 | case SIGINT: syslog(LOG_NOTICE, "Keyboard interrupt, shutting down"); |
1 | 70 | break; |
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71 | case SIGTERM: syslog(LOG_NOTICE, "Got SIGTERM, shutting down"); |
1 | 72 | break; |
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73 | default: syslog(LOG_NOTICE, "die() on signal %d", onsig); |
1 | 74 | } |
75 | ||
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76 | my_shutdown = true; |
6 | 77 | } |
78 | ||
79 | ||
80 | ||
81 | void my_connect_callback(struct mosquitto *mosq, void *obj, int result) | |
82 | { | |
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83 | if (connect_lost) { |
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84 | connect_lost = false; |
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85 | syslog(LOG_NOTICE, "Reconnect: %s", mosquitto_connack_string(result)); |
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86 | } |
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87 | |
6 | 88 | if (!result) { |
89 | status = STATUS_CONNACK_RECVD; | |
90 | } else { | |
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91 | syslog(LOG_NOTICE, "my_connect_callback: %s\n", mosquitto_connack_string(result)); |
6 | 92 | } |
93 | } | |
94 | ||
95 | ||
96 | ||
97 | void my_disconnect_callback(struct mosquitto *mosq, void *obj, int rc) | |
98 | { | |
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99 | if (my_shutdown) { |
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100 | syslog(LOG_NOTICE, "Acknowledged DISCONNECT from %s", Config.mosq_host); |
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101 | connected = false; |
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102 | } else { |
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103 | /* |
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104 | * The remove server was brought down. We must keep running |
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105 | */ |
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106 | syslog(LOG_NOTICE, "Received DISCONNECT from %s, connection lost", Config.mosq_host); |
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107 | connect_lost = true; |
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108 | } |
6 | 109 | } |
110 | ||
111 | ||
112 | ||
113 | void my_publish_callback(struct mosquitto *mosq, void *obj, int mid) | |
114 | { | |
115 | last_mid_sent = mid; | |
116 | } | |
117 | ||
118 | ||
119 | ||
120 | void my_log_callback(struct mosquitto *mosq, void *obj, int level, const char *str) | |
121 | { | |
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122 | syslog(LOG_NOTICE, "MQTT: %s", str); |
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123 | printf("MQTT: %s\n", str); |
1 | 124 | } |
125 | ||
126 | ||
127 | ||
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128 | #ifdef HAVE_WIRINGPI_H |
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129 | void stopLCD(void) |
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130 | { |
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131 | lcdClear(lcdHandle); |
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132 | setBacklight(0); |
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133 | } |
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134 | #endif |
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135 | |
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136 | |
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137 | |
1 | 138 | int main(int argc, char *argv[]) |
139 | { | |
12 | 140 | int rc, c, i; |
141 | pid_t frk; | |
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142 | #ifdef HAVE_WIRINGPI_H |
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143 | char buf[80]; |
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144 | #endif |
1 | 145 | |
146 | while (1) { | |
147 | int option_index = 0; | |
148 | static struct option long_options[] = { | |
149 | {"debug", 0, 0, 'c'}, | |
150 | {"help", 0, 0, 'h'}, | |
151 | {0, 0, 0, 0} | |
152 | }; | |
153 | ||
154 | c = getopt_long(argc, argv, "dh", long_options, &option_index); | |
155 | if (c == -1) | |
156 | break; | |
157 | ||
158 | switch (c) { | |
6 | 159 | case 'd': debug = true; |
1 | 160 | break; |
161 | case 'h': help(); | |
162 | return 1; | |
163 | } | |
164 | } | |
165 | ||
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166 | openlog("thermometers", LOG_PID|LOG_CONS|LOG_NOWAIT, LOG_USER); |
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167 | syslog(LOG_NOTICE, "mbsePi-apps thermometers v%s starting", VERSION); |
12 | 168 | if (debug) |
169 | fprintf(stdout, "mbsePi-apps thermometers v%s starting\n", VERSION); | |
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170 | |
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171 | if (rdconfig((char *)"thermometers.conf")) { |
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172 | fprintf(stderr, "Error reading configuration\n"); |
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173 | syslog(LOG_NOTICE, "halted"); |
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174 | return 1; |
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175 | } |
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176 | |
1 | 177 | /* |
178 | * Catch all the signals we can, and ignore the rest. Note that SIGKILL can't be ignored | |
179 | * but that's live. This daemon should only be stopped by SIGTERM. | |
180 | * Don't catch SIGCHLD. | |
181 | */ | |
182 | for (i = 0; i < NSIG; i++) { | |
183 | if ((i != SIGCHLD) && (i != SIGKILL) && (i != SIGSTOP)) | |
184 | signal(i, (void (*))die); | |
185 | } | |
186 | ||
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187 | #ifdef HAVE_WIRINGPI_H |
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188 | |
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189 | if (wiringPiSetup () ) |
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190 | return 1; |
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191 | |
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192 | if ((rc = initLCD (16, 2))) { |
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193 | fprintf(stderr, "Cannot initialize LCD display, rc=%d\n", rc); |
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194 | return 1; |
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195 | } |
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196 | |
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197 | lcdPosition(lcdHandle, 0, 0); |
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198 | lcdPuts(lcdHandle, "Thermometers"); |
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199 | lcdPosition(lcdHandle, 0, 1); |
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200 | sprintf(buf, "Version %s", VERSION); |
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201 | lcdPuts(lcdHandle, buf); |
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202 | #endif |
12 | 203 | |
204 | if (debug) { | |
205 | /* | |
206 | * For debugging run in foreground. | |
207 | */ | |
208 | rc = server(); | |
209 | } else { | |
210 | /* | |
211 | * Server initialization is complete. Now we can fork the | |
212 | * daemon and return to the user. We need to do a setpgrp | |
213 | * so that the daemon will no longer be assosiated with the | |
214 | * users control terminal. This is done before the fork, so | |
215 | * that the child will not be a process group leader. Otherwise, | |
216 | * if the child were to open a terminal, it would become | |
217 | * associated with that terminal as its control terminal. | |
218 | */ | |
219 | if ((pgrp = setpgid(0, 0)) == -1) { | |
220 | syslog(LOG_NOTICE, "setpgpid failed"); | |
221 | } | |
222 | ||
223 | frk = fork(); | |
224 | switch (frk) { | |
225 | case -1: | |
226 | syslog(LOG_NOTICE, "Daemon fork failed: %s", strerror(errno)); | |
227 | syslog(LOG_NOTICE, "Finished, rc=1"); | |
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228 | #ifdef HAVE_WIRINGPI_H |
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229 | stopLCD(); |
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230 | #endif |
12 | 231 | exit(1); |
232 | case 0: /* | |
233 | * Run the daemon | |
234 | */ | |
235 | fclose(stdin); | |
236 | if (open("/dev/null", O_RDONLY) != 0) { | |
237 | syslog(LOG_NOTICE, "Reopen of stdin to /dev/null failed"); | |
238 | _exit(2); | |
239 | } | |
240 | fclose(stdout); | |
241 | if (open("/dev/null", O_WRONLY | O_APPEND | O_CREAT,0600) != 1) { | |
242 | syslog(LOG_NOTICE, "Reopen of stdout to /dev/null failed"); | |
243 | _exit(2); | |
244 | } | |
245 | fclose(stderr); | |
246 | if (open("/dev/null", O_WRONLY | O_APPEND | O_CREAT,0600) != 2) { | |
247 | syslog(LOG_NOTICE, "Reopen of stderr to /dev/null failed"); | |
248 | _exit(2); | |
249 | } | |
250 | mypid = getpid(); | |
251 | rc = server(); | |
252 | break; | |
253 | /* Not reached */ | |
254 | default: | |
255 | /* | |
256 | * Here we detach this process and let the child | |
257 | * run the deamon process. | |
258 | */ | |
259 | syslog(LOG_NOTICE, "Starting daemon with pid %d", frk); | |
260 | exit(0); | |
261 | } | |
262 | } | |
263 | ||
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264 | syslog(LOG_NOTICE, "Finished, rc=%d", rc); |
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265 | return rc; |
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266 | } |
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267 | |
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268 | |
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269 | |
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270 | int server(void) |
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271 | { |
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272 | char *id = NULL, *state = NULL; |
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273 | struct mosquitto *mosq = NULL; |
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274 | char hostname[256], buf[1024]; |
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275 | int temp, rc, deviation, keepalive = 60; |
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276 | #ifdef HAVE_WIRINGPI_H |
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277 | int lcdupdate; |
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278 | #endif |
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279 | unsigned int max_inflight = 20; |
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280 | char err[1024]; |
10 | 281 | w1_therm *tmp1, *old1; |
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282 | char *device, *alias, line[60], *p = NULL; |
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283 | FILE *fp; |
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284 | |
6 | 285 | /* |
286 | * Initialize mosquitto communication | |
287 | */ | |
288 | mosquitto_lib_init(); | |
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289 | |
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290 | /* |
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291 | * Build MQTT id |
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292 | */ |
6 | 293 | hostname[0] = '\0'; |
294 | gethostname(hostname, 256); | |
295 | hostname[255] = '\0'; | |
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296 | |
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297 | id = xstrcpy((char *)"thermometers/"); |
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298 | id = xstrcat(id, hostname); |
6 | 299 | if(strlen(id) > MOSQ_MQTT_ID_MAX_LENGTH) { |
300 | /* | |
301 | * Enforce maximum client id length of 23 characters | |
302 | */ | |
303 | id[MOSQ_MQTT_ID_MAX_LENGTH] = '\0'; | |
304 | } | |
1 | 305 | |
6 | 306 | mosq = mosquitto_new(id, true, NULL); |
307 | if(!mosq) { | |
308 | switch(errno) { | |
309 | case ENOMEM: | |
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310 | syslog(LOG_NOTICE, "mosquitto_new: Out of memory"); |
6 | 311 | break; |
312 | case EINVAL: | |
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313 | syslog(LOG_NOTICE, "mosquitto_new: Invalid id"); |
6 | 314 | break; |
315 | } | |
316 | mosquitto_lib_cleanup(); | |
317 | return 1; | |
318 | } | |
319 | ||
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320 | if (debug) { |
6 | 321 | mosquitto_log_callback_set(mosq, my_log_callback); |
322 | } | |
323 | ||
324 | /* | |
325 | * Set our will | |
326 | */ | |
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327 | state = xstrcpy((char *)"clients/"); |
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328 | state = xstrcat(state, hostname); |
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329 | state = xstrcat(state, (char *)"/thermometers/state"); |
6 | 330 | sprintf(buf, "0"); |
12 | 331 | if ((rc = mosquitto_will_set(mosq, state, strlen(buf), buf, qos, true))) { |
6 | 332 | if (rc == MOSQ_ERR_INVAL) { |
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333 | syslog(LOG_NOTICE, "mosquitto_will_set: input parameters invalid"); |
6 | 334 | } else if (rc == MOSQ_ERR_NOMEM) { |
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335 | syslog(LOG_NOTICE, "mosquitto_will_set: Out of Memory"); |
6 | 336 | } else if (rc == MOSQ_ERR_PAYLOAD_SIZE) { |
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337 | syslog(LOG_NOTICE, "mosquitto_will_set: invalid payload size"); |
6 | 338 | } |
339 | mosquitto_lib_cleanup(); | |
340 | return rc; | |
341 | } | |
342 | ||
343 | mosquitto_max_inflight_messages_set(mosq, max_inflight); | |
344 | mosquitto_connect_callback_set(mosq, my_connect_callback); | |
345 | mosquitto_disconnect_callback_set(mosq, my_disconnect_callback); | |
346 | mosquitto_publish_callback_set(mosq, my_publish_callback); | |
347 | ||
12 | 348 | if ((rc = mosquitto_connect(mosq, Config.mosq_host, Config.mosq_port, keepalive))) { |
6 | 349 | if (rc == MOSQ_ERR_ERRNO) { |
350 | strerror_r(errno, err, 1024); | |
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351 | syslog(LOG_NOTICE, "mosquitto_connect: error: %s", err); |
6 | 352 | } else { |
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353 | syslog(LOG_NOTICE, "mosquitto_connect: unable to connect (%d)", rc); |
6 | 354 | } |
355 | mosquitto_lib_cleanup(); | |
356 | return rc; | |
357 | } | |
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358 | syslog(LOG_NOTICE, "Connected with %s:%d", Config.mosq_host, Config.mosq_port); |
6 | 359 | |
360 | /* | |
361 | * Initialise is complete, report our presence state | |
362 | */ | |
363 | mosquitto_loop_start(mosq); | |
364 | sprintf(buf, "1"); | |
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365 | rc = mosquitto_publish(mosq, &mid_sent, state, strlen(buf), buf, qos, 1); |
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366 | #ifdef HAVE_WIRINGPI_H |
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367 | setBacklight(0); |
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368 | #endif |
6 | 369 | |
14 | 370 | /* |
371 | * Report alias names | |
372 | */ | |
373 | for (tmp1 = Config.w1therms; tmp1; tmp1 = old1) { | |
374 | old1 = tmp1->next; | |
375 | ||
376 | alias = xstrcpy((char *)"/raw/"); | |
377 | alias = xstrcat(alias, hostname); | |
378 | alias = xstrcat(alias, (char *)"/thermometers/w1/"); | |
379 | alias = xstrcat(alias, tmp1->master); | |
380 | alias = xstrcat(alias, (char *)"/"); | |
381 | alias = xstrcat(alias, tmp1->name); | |
382 | alias = xstrcat(alias, (char *)"/alias"); | |
383 | ||
384 | sprintf(buf, "%s", tmp1->alias); | |
385 | if ((rc = mosquitto_publish(mosq, &mid_sent, alias, strlen(buf), buf, qos, 1))) { | |
386 | if (rc == MOSQ_ERR_NO_CONN) | |
387 | mosquitto_reconnect(mosq); | |
388 | else | |
389 | syslog(LOG_NOTICE, "mainloop: error %d from mosquitto_publish", rc); | |
390 | } | |
391 | ||
392 | free(alias); | |
393 | alias = NULL; | |
394 | } | |
395 | ||
12 | 396 | if (debug) |
397 | fprintf(stdout, (char *)"Enter loop, connected %d\n", connected); | |
398 | ||
6 | 399 | do { |
400 | if (status == STATUS_CONNACK_RECVD) { | |
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401 | #ifdef HAVE_WIRINGPI_H |
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402 | lcdupdate = FALSE; |
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403 | #endif |
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404 | |
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405 | /* |
12 | 406 | * Here send our 1-wire sensors values |
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407 | */ |
10 | 408 | for (tmp1 = Config.w1therms; tmp1; tmp1 = old1) { |
409 | old1 = tmp1->next; | |
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410 | |
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411 | /* |
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412 | * Build path and alias topic |
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413 | */ |
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414 | device = xstrcpy((char *)"/sys/bus/w1/devices/"); |
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415 | device = xstrcat(device, tmp1->master); |
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416 | device = xstrcat(device, (char *)"/"); |
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417 | device = xstrcat(device, tmp1->name); |
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418 | device = xstrcat(device, (char *)"/w1_slave"); |
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419 | alias = xstrcpy((char *)"/raw/"); |
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420 | alias = xstrcat(alias, hostname); |
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421 | alias = xstrcat(alias, (char *)"/thermometers/w1/"); |
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422 | alias = xstrcat(alias, tmp1->master); |
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423 | alias = xstrcat(alias, (char *)"/"); |
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424 | alias = xstrcat(alias, tmp1->name); |
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425 | alias = xstrcat(alias, (char *)"/temperature"); |
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426 | |
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427 | /* |
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428 | * Read sensor data |
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429 | */ |
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430 | if ((fp = fopen(device, "r"))) { |
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431 | /* |
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432 | * The output looks like: |
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433 | * 72 01 4b 46 7f ff 0e 10 57 : crc=57 YES |
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434 | * 72 01 4b 46 7f ff 0e 10 57 t=23125 |
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435 | */ |
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436 | fgets(line, 50, fp); |
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437 | line[strlen(line)-1] = '\0'; |
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438 | if ((line[36] == 'Y') && (line[37] == 'E')) { |
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439 | /* |
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440 | * CRC is Ok, continue |
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441 | */ |
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442 | fgets(line, 50, fp); |
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443 | line[strlen(line)-1] = '\0'; |
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444 | strtok(line, (char *)"="); |
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445 | p = strtok(NULL, (char *)"="); |
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446 | rc = sscanf(p, "%d", &temp); |
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447 | if ((rc == 1) && (tmp1->lastval != temp)) { |
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448 | /* |
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449 | * It is possible to have read errors or extreme values. |
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450 | * This can happen with bad connections so we compare the |
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451 | * value with the previous one. If the difference is too |
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452 | * much, we don't send that value. That also means that if |
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453 | * the next value is ok again, it will be marked invalid too. |
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454 | * Maximum error is 20 degrees for now. |
11
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455 | */ |
16
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456 | deviation = 20000; |
11
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457 | if ((tmp1->lastval == 0) || |
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458 | (tmp1->lastval && (temp > (tmp1->lastval - deviation)) && (temp < (tmp1->lastval + deviation)))) { |
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459 | /* |
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460 | * Temperature is changed and valid, update and publish this. |
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461 | */ |
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462 | sprintf(buf, "%.1f", temp / 1000.0); |
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Version 0.0.1, changed data topics to /raw tree
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463 | if ((rc = mosquitto_publish(mosq, &mid_sent, alias, strlen(buf), buf, qos, 1))) { |
11
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464 | if (rc == MOSQ_ERR_NO_CONN) |
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465 | mosquitto_reconnect(mosq); |
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466 | else |
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467 | syslog(LOG_NOTICE, "mainloop: error %d from mosquitto_publish", rc); |
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468 | } |
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469 | } else { |
16
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470 | syslog(LOG_NOTICE, "deviation error deviation=%d, old=%d new=%d", deviation, tmp1->lastval, temp); |
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471 | if (debug) { |
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472 | fprintf(stdout, "deviation error deviation=%d, old=%d new=%d\n", deviation, tmp1->lastval, temp); |
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473 | } |
11
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474 | } |
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475 | tmp1->lastval = temp; |
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476 | #ifdef HAVE_WIRINGPI_H |
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477 | lcdupdate = TRUE; |
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478 | #endif |
11
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479 | } |
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480 | } else { |
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481 | syslog(LOG_NOTICE, "sensor %s/%s CRC error", tmp1->master, tmp1->name); |
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482 | } |
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483 | fclose(fp); |
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484 | tmp1->present = 1; |
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485 | } else { |
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486 | tmp1->present = 0; |
12 | 487 | if (debug) |
488 | printf("sensor %s is missing\n", tmp1->name); | |
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489 | } |
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490 | |
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491 | free(device); |
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492 | device = NULL; |
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493 | free(alias); |
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494 | alias = NULL; |
10 | 495 | } |
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496 | |
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497 | #ifdef HAVE_WIRINGPI_H |
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498 | if (lcdupdate) { |
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499 | lcdPosition(lcdHandle, 0, 0); |
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500 | tmp1 = Config.w1therms; |
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501 | snprintf(buf, 16, "%5.1f %cC %s ", tmp1->lastval / 1000.0, 0xdf, tmp1->alias); |
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502 | lcdPuts(lcdHandle, buf); |
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503 | old1 = tmp1->next; |
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504 | tmp1 = old1; |
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505 | lcdPosition(lcdHandle, 0, 1); |
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506 | snprintf(buf, 16, "%5.1f %cC %s ", tmp1->lastval / 1000.0, 0xdf, tmp1->alias); |
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507 | lcdPuts(lcdHandle, buf); |
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508 | } |
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509 | #endif |
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510 | |
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511 | if (my_shutdown) { |
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512 | /* |
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513 | * Final publish 0 to clients/<hostname>/thermometers/state |
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514 | */ |
6 | 515 | sprintf(buf, "0"); |
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516 | mosquitto_publish(mosq, &mid_sent, state, strlen(buf), buf, qos, true); |
6 | 517 | last_mid = mid_sent; |
518 | status = STATUS_WAITING; | |
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519 | #ifdef HAVE_WIRINGPI_H |
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520 | lcdClear(lcdHandle); |
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521 | lcdPosition(lcdHandle, 0, 0); |
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522 | lcdPuts(lcdHandle, "Shuting down ..."); |
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523 | #endif |
6 | 524 | } |
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525 | |
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526 | usleep(100000); |
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527 | |
6 | 528 | } else if (status == STATUS_WAITING) { |
12 | 529 | if (debug) |
530 | fprintf(stdout, (char *)"Waiting\n"); | |
6 | 531 | if (last_mid_sent == last_mid && disconnect_sent == false) { |
532 | mosquitto_disconnect(mosq); | |
533 | disconnect_sent = true; | |
534 | } | |
535 | usleep(100000); | |
536 | } | |
537 | rc = MOSQ_ERR_SUCCESS; | |
538 | ||
12 | 539 | } while (rc == MOSQ_ERR_SUCCESS && connected); |
540 | ||
541 | if (debug) | |
542 | fprintf(stdout, (char *)"Out of loop\n"); | |
6 | 543 | |
544 | mosquitto_loop_stop(mosq, false); | |
545 | mosquitto_destroy(mosq); | |
546 | mosquitto_lib_cleanup(); | |
547 | ||
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548 | #ifdef HAVE_WIRINGPI_H |
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549 | stopLCD(); |
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550 | #endif |
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551 | |
12 | 552 | return rc; |
1 | 553 | } |
554 |