[大数据]C程序监听mqtt消息保存数据到influxdb时序数据库

设备通过mqtt消息上报坐标信息保存到时序数据库，查询历史数据回放设备轨迹。

#include <stdio.h>
#include <string.h>
#include "mosquitto.h"
#include <cjson/cJSON.h>
#include "influxdb.h"
#define LOGOUT 0
#define LOGIN 1
#define STREAMING 2
#define TALKBACK 3

char mqtt_host[512] = "localhost";
int mqtt_port = 1883;
char username[48] = "test";
char password[48] = "12345";
char clientid[48] = "presence";

void saveUwb(cJSON *root){
    char buf[512] = "uwb,";
    time_t t;
    time(&t);
    cJSON *TagId = cJSON_GetObjectItem(root,"TagId");
    if(TagId){
        snprintf(buf+strlen(buf), sizeof(buf) - sizeof(char) * strlen(buf), "tagid=%s ",TagId->valuestring);
    }
    cJSON *x = cJSON_GetObjectItem(root,"x");
    if(x){
        snprintf(buf+strlen(buf), sizeof(buf) - sizeof(char) * strlen(buf), "x=%s",x->valuestring);
    }
    cJSON *y = cJSON_GetObjectItem(root,"y");
    if(y){
        snprintf(buf+strlen(buf), sizeof(buf) - sizeof(char) * strlen(buf), ",y=%s",y->valuestring);
    }
	cJSON *sn = cJSON_GetObjectItem(root,"sn");
    if(sn){
        snprintf(buf+strlen(buf), sizeof(buf) - sizeof(char) * strlen(buf), ",sn=%s",sn->valuestring);
    }
    snprintf(buf+strlen(buf), sizeof(buf) - sizeof(char) * strlen(buf), ",datetime=%ld",t);
    s_influxdb_client *client = influxdb_client_new("localhost:8086","admin","admin","mydb",0);
    printf("buf : %s\n",buf);           
    int status = influxdb_insert(client,buf);      
    printf("status : %d,%s\n",status,client->dbname);
    influxdb_client_free(client);		

}

void message_callback(struct mosquitto *mosq, void *obj, const struct mosquitto_message *message)
{
    cJSON * root = cJSON_Parse((char *)message->payload);
    if (!root){
        printf("Received msg payload[%s], json parse failed\n", (char*)message->payload);
        return;
    }
    printf("Received message is %s\n", (char *)message->payload);
    printf("topic is %s\n", (char *)message->topic);
    if (!strcasecmp((char *)message->topic,"/mvms/client/uwb/")){
        saveUwb(root);
    }

    if (root){
        cJSON_Delete(root);
    }
}

int main(int argc, char * argv[])
{
    int rc = 0;
    struct mosquitto *mosq;
    mosquitto_lib_init();

    mosq = mosquitto_new(clientid, true, NULL);
    if (mosq){
        mosquitto_username_pw_set(mosq, username, password);
        mosquitto_connect_callback_set(mosq, connect_callback);
        mosquitto_message_callback_set(mosq, message_callback);

        rc = mosquitto_connect(mosq, mqtt_host, mqtt_port, 45);
		
		char topic_uwb[512]={0};
        snprintf(topic_uwb, sizeof(topic_uwb)-1, "/mvms/client/uwb/#");

        mosquitto_subscribe(mosq, NULL, topic_uwb, 2);

        mosquitto_loop_forever(mosq, -1, 1);

        mosquitto_destroy(mosq);
    }
    mosquitto_lib_cleanup();
    return rc;
}