From 68826376ee5f47783c644c6604f4411ec747cd7e Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Fri, 14 Nov 2025 23:52:16 +0800
Subject: [PATCH] Add UDP DNS client source code
---
project/4.mqttd/mqttd.c | 434 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 434 insertions(+), 0 deletions(-)
diff --git a/project/4.mqttd/mqttd.c b/project/4.mqttd/mqttd.c
new file mode 100644
index 0000000..a22a6b9
--- /dev/null
+++ b/project/4.mqttd/mqttd.c
@@ -0,0 +1,434 @@
+/*********************************************************************************
+ * Copyright: (C) 2019 LingYun IoT System Studio
+ * All rights reserved.
+ *
+ * Filename: main.c
+ * Description: This file
+ *
+ * Version: 1.0.0(29/01/19)
+ * Author: Guo Wenxue <guowenxue@gmail.com>
+ * ChangeLog: 1, Release initial version on "29/01/19 15:34:41"
+ *
+ ********************************************************************************/
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <getopt.h>
+#include <libgen.h>
+#include <string.h>
+#include <errno.h>
+
+#include <mosquitto.h>
+#include <cjson/cJSON.h>
+
+#include "logger.h"
+#include "proc.h"
+#include "config.h"
+#include "ds18b20.h"
+#include "sht20.h"
+#include "leds.h"
+
+#define PROG_VERSION "v1.0.0"
+#define DAEMON_PIDFILE "/tmp/.mqtt.pid"
+
+void *mqtt_sub_worker(void *args);
+void *mqtt_pub_worker(void *args);
+
+static void program_usage(char *progname)
+{
+
+ printf("Usage: %s [OPTION]...\n", progname);
+ printf(" %s is LingYun studio MQTT daemon program running on RaspberryPi\n", progname);
+
+ printf("\nMandatory arguments to long options are mandatory for short options too:\n");
+ printf(" -d[debug ] Running in debug mode\n");
+ printf(" -c[conf ] Specify configure file\n");
+ printf(" -h[help ] Display this help information\n");
+ printf(" -v[version ] Display the program version\n");
+
+ printf("\n%s version %s\n", progname, PROG_VERSION);
+ return;
+}
+
+int main (int argc, char **argv)
+{
+ int daemon = 1;
+ pthread_t tid;
+ mqtt_ctx_t ctx;
+ char *conf_file="/etc/mqttd.conf";
+ int debug = 0;
+ int opt;
+ char *progname=NULL;
+
+ struct option long_options[] = {
+ {"conf", required_argument, NULL, 'c'},
+ {"debug", no_argument, NULL, 'd'},
+ {"version", no_argument, NULL, 'v'},
+ {"help", no_argument, NULL, 'h'},
+ {NULL, 0, NULL, 0}
+ };
+
+ progname = (char *)basename(argv[0]);
+
+ /* parser the command line parameters */
+ while ((opt = getopt_long(argc, argv, "c:dvh", long_options, NULL)) != -1)
+ {
+ switch (opt)
+ {
+ case 'c': /* Set configure file */
+ conf_file = optarg;
+ break;
+
+ case 'd': /* Set debug running */
+ daemon = 0;
+ debug = 1;
+ break;
+
+ case 'v': /* Get software version */
+ printf("%s version %s\n", progname, PROG_VERSION);
+ return 0;
+
+ case 'h': /* Get help information */
+ program_usage(progname);
+ return 0;
+
+ default:
+ break;
+ }
+
+ }
+
+ if( !conf_file )
+ debug = 1;
+
+ /* parser configure file */
+ if( mqttd_parser_conf(conf_file, &ctx, debug)<0 )
+ {
+ fprintf(stderr, "Parser mqtted configure file failure\n");
+ return -2;
+ }
+
+ /* install signal proc handler */
+ install_default_signal();
+
+ /* check program already running or not, if already running then exit, or set running as daemon */
+ if( check_set_program_running(daemon, DAEMON_PIDFILE) < 0 )
+ goto cleanup;
+
+ /* initial mosquitto library */
+ mosquitto_lib_init();
+
+ /* create MQTT subsciber thread */
+ if( thread_start(&tid, mqtt_sub_worker, &ctx ) < 0 )
+ {
+ log_error("Start MQTT subsciber worker thread failure\n");
+ goto cleanup;
+ }
+ log_info("Start MQTT subsciber worker thread ok\n");
+
+ /* create MQTT publisher thread */
+ if( thread_start(&tid, mqtt_pub_worker, &ctx) < 0 )
+ {
+ log_error("Start MQTT publisher worker thread failure\n");
+ goto cleanup;
+ }
+ log_info("Start MQTT publisher worker thread ok\n");
+
+ while( ! g_signal.stop )
+ {
+ msleep(1000);
+ }
+
+cleanup:
+ mosquitto_lib_cleanup();
+ log_close();
+
+ return 0;
+} /* ----- End of main() ----- */
+
+void pub_connect_callback(struct mosquitto *mosq, void *userdata, int result)
+{
+ mqtt_ctx_t *ctx = (mqtt_ctx_t *)userdata;
+ int rv = 0;
+ char msg[128];
+ float temp = 0.0; /* temperature */
+ float rh = 0.0; /* relative humidity */
+ int retain = 0;
+
+ if( result )
+ {
+ log_error("Publisher connect to broker server[%s:%d] failed, rv=%d\n", ctx->host, ctx->port, result);
+ return ;
+ }
+
+ log_info("Publisher connect to broker server[%s:%d] successfully\n", ctx->host, ctx->port);
+ log_debug("Publish topic '%s'\n", ctx->pubTopic);
+
+ if( ctx->hwconf.ds18b20 )
+ {
+ memset(msg, 0, sizeof(msg));
+
+ log_debug("DS18B20 temperature sensor enabled, start broadcast it\n");
+
+ if( ds18b20_get_temperature(&temp) < 0 )
+ snprintf(msg, sizeof(msg), "{ \"id\":%s, \"temp\":\"error\" }", ctx->devid);
+ else
+ snprintf(msg, sizeof(msg), "{ \"id\":%s, \"temp\":\"%.2f\" }", ctx->devid, temp);
+
+ rv = mosquitto_publish(mosq, NULL, ctx->pubTopic, strlen(msg), msg, ctx->pubQos, retain);
+ if( rv )
+ {
+ log_error("Publisher broadcast message '%s' failure: %d\n", msg, rv);
+ }
+ else
+ {
+ log_info("Publisher broadcast message '%s' ok\n", msg);
+ }
+ }
+
+ if( ctx->hwconf.sht2x )
+ {
+ memset(msg, 0, sizeof(msg));
+
+ log_debug("SHT2X temperature and humidity sensor enabled, start broadcast it\n");
+
+ if( sht2x_get_temp_humidity(&temp, &rh) < 0 )
+ snprintf(msg, sizeof(msg), "{ \"id\":%s, \"temp\":\"error\", \"RH\":\"error\" }", ctx->devid);
+ else
+ snprintf(msg, sizeof(msg), "{ \"id\":%s, \"temp\":\"%.2f\", \"RH\":\"%.2f\" }", ctx->devid, temp, rh);
+
+ rv = mosquitto_publish(mosq, NULL, ctx->pubTopic, strlen(msg), msg, ctx->pubQos, retain);
+ if( rv )
+ {
+ log_error("Publisher broadcast message '%s' failure: %d\n", msg, rv);
+ }
+ else
+ {
+ log_info("Publisher broadcast message '%s' ok\n", msg);
+ }
+ }
+
+ log_info("Publisher broadcast over and disconnect broker now\n", ctx->host, ctx->port);
+ mosquitto_disconnect(mosq);
+
+ return ;
+}
+
+
+void *mqtt_pub_worker(void *args)
+{
+ mqtt_ctx_t *ctx = (mqtt_ctx_t *)args;
+ struct mosquitto *mosq;
+ bool session = true;
+
+
+ mosq = mosquitto_new(NULL, session, ctx);
+ if( !mosq )
+ {
+ log_error("mosquitto_new failure\n");
+ return NULL;
+ }
+
+ /* set connnect to broker username and password */
+ if( strlen(ctx->uid)> 0 && strlen(ctx->pwd)> 0 )
+ mosquitto_username_pw_set(mosq, ctx->uid, ctx->pwd);
+
+ /* set callback functions */
+ mosquitto_connect_callback_set(mosq, pub_connect_callback);
+
+ while( !g_signal.stop )
+ {
+ /* connect to MQTT broker */
+ if( mosquitto_connect(mosq, ctx->host, ctx->port, ctx->keepalive) )
+ {
+ log_error("Publisher connect to broker[%s:%d] failure: %s\n", ctx->host, ctx->port, strerror(errno));
+ msleep(1000);
+ continue;
+ }
+
+ /* -1: use default timeout 1000ms 1: unused */
+ mosquitto_loop_forever(mosq, -1, 1);
+
+ /* Publisher broadcast sensors data message interval time, unit seconds */
+ sleep( ctx->interval );
+ }
+
+ mosquitto_destroy(mosq);
+ return NULL;
+}
+
+void sub_connect_callback(struct mosquitto *mosq, void *userdata, int result)
+{
+ mqtt_ctx_t *ctx = (mqtt_ctx_t *)userdata;
+
+ if( result )
+ {
+ log_error("Subscriber connect to broker server failed, rv=%d\n", result);
+ return ;
+ }
+
+ log_info("Subscriber connect to broker server[%s:%d] successfully\n", ctx->host, ctx->port);
+ mosquitto_subscribe(mosq, NULL, ctx->subTopic, ctx->subQos);
+}
+
+void sub_disconnect_callback(struct mosquitto *mosq, void *userdata, int result)
+{
+ mqtt_ctx_t *ctx = (mqtt_ctx_t *)userdata;
+
+ log_warn("Subscriber disconnect to broker server[%s:%d], reason=%d\n", ctx->host, ctx->port, result);
+}
+
+static inline void mqtt_turn_led(int which, char *cmd)
+{
+ if( strcasestr(cmd, "on") )
+ turn_led(which, ON);
+ else if( strcasestr(cmd, "off") )
+ turn_led(which, OFF);
+}
+
+void proc_json_items(cJSON *root, mqtt_ctx_t *ctx)
+{
+ int i;
+ cJSON *item;
+ cJSON *array;
+ hwconf_t *hwconf = &ctx->hwconf;
+
+ if( !root )
+ {
+ log_error("Invalid input arguments $root\n");
+ return ;
+ }
+
+ for( i=0; i<cJSON_GetArraySize(root); i++ )
+ {
+ item = cJSON_GetArrayItem(root, i);
+ if( !item )
+ break;
+
+ /* if item is cJSON_Object, then recursive call proc_json */
+ if( cJSON_Object == item->type )
+ {
+ proc_json_items(item, ctx);
+ }
+ else if( cJSON_Array == item->type )
+ {
+ /* RGB colors led control: {"id":"RPi3B#01", "leds":[{"red":"on","green":"off","blue":"on"}]} */
+ if( hwconf->led && !strcasecmp(item->string, "leds") )
+ {
+ array = cJSON_GetArrayItem(item, 0);
+ if( NULL != array )
+ {
+ cJSON *led_item;
+
+ if( NULL != (led_item=cJSON_GetObjectItem(array , "red")) )
+ {
+ log_info("turn red led '%s'\n", led_item->valuestring);
+ mqtt_turn_led(LED_R, led_item->valuestring);
+ }
+
+ if( NULL != (led_item=cJSON_GetObjectItem(array , "green")) )
+ {
+ log_info("turn green led '%s'\n", led_item->valuestring);
+ mqtt_turn_led(LED_G, led_item->valuestring);
+ }
+
+ if( NULL != (led_item=cJSON_GetObjectItem(array , "blue")) )
+ {
+ log_info("turn blue led '%s'\n", led_item->valuestring);
+ mqtt_turn_led(LED_B, led_item->valuestring);
+ }
+ }
+ }
+ }
+ }
+}
+
+void sub_message_callback(struct mosquitto *mosq, void *userdata, const struct mosquitto_message *message)
+{
+ mqtt_ctx_t *ctx = (mqtt_ctx_t *)userdata;
+
+ cJSON *root = NULL;
+ cJSON *item;
+ char *value;
+
+ if ( !message->payloadlen )
+ {
+ log_error("%s (null)\n", message->topic);
+ return ;
+ }
+
+ log_debug("Subscriber receive message: '%s'\n", message->payload);
+
+ root = cJSON_Parse(message->payload);
+ if( !root )
+ {
+ log_error("cJSON_Parse parser failure: %s\n", cJSON_GetErrorPtr());
+ return ;
+ }
+
+ item = cJSON_GetObjectItem(root, "id");
+ if( !item )
+ {
+ log_error("cJSON_Parse get ID failure: %s\n", cJSON_GetErrorPtr());
+ goto cleanup;
+ }
+
+ value = cJSON_PrintUnformatted(item);
+ if( strcasecmp(value, ctx->devid) )
+ {
+ free(value);
+ goto cleanup;
+ }
+
+ free(value);
+ log_info("Subscriber receive message: '%s'\n", message->payload);
+
+ proc_json_items(root, ctx);
+
+cleanup:
+ cJSON_Delete(root); /* must delete it, or it will result memory leak */
+ return ;
+}
+
+
+void *mqtt_sub_worker(void *args)
+{
+ mqtt_ctx_t *ctx = (mqtt_ctx_t *)args;
+ struct mosquitto *mosq;
+ bool session = true;
+
+ mosq = mosquitto_new(NULL, session, ctx);
+ if( !mosq )
+ {
+ log_error("mosquitto_new failure\n");
+ return NULL;
+ }
+
+ /* set connnect to broker username and password */
+ if( strlen(ctx->uid)> 0 && strlen(ctx->pwd)> 0 )
+ mosquitto_username_pw_set(mosq, ctx->uid, ctx->pwd);
+
+ /* set callback functions */
+ mosquitto_connect_callback_set(mosq, sub_connect_callback);
+ mosquitto_disconnect_callback_set(mosq, sub_disconnect_callback);
+ mosquitto_message_callback_set(mosq, sub_message_callback);
+
+ while( !g_signal.stop )
+ {
+ /* connect to MQTT broker */
+ if( mosquitto_connect(mosq, ctx->host, ctx->port, ctx->keepalive) )
+ {
+ log_error("Subscriber connect to broker[%s:%d] failure: %s\n", ctx->host, ctx->port, strerror(errno));
+ msleep(1000);
+ continue;
+ }
+
+ /* -1: use default timeout 1000ms 1: unused */
+ mosquitto_loop_forever(mosq, -1, 1);
+ }
+
+ mosquitto_destroy(mosq);
+ return NULL;
+}
+
--
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