linux下用c实现传送json数据至mosquitto服务器
时间: 2023-12-27 12:05:23 浏览: 62
要在Linux下使用C语言将JSON数据传输到Mosquitto服务器,需要使用MQTT协议进行通信。下面是简单的步骤:
1. 安装Mosquitto客户端库
在Linux终端中运行以下命令安装Mosquitto客户端库:
```
sudo apt-get install libmosquitto-dev
```
2. 编写C程序
使用Mosquitto客户端库编写C程序。以下是示例代码:
```
#include <stdio.h>
#include <mosquitto.h>
#include <json-c/json.h>
void on_connect(struct mosquitto *mosq, void *obj, int rc)
{
printf("Connected to Mosquitto\n");
}
void on_publish(struct mosquitto *mosq, void *obj, int mid)
{
printf("Message %d sent to Mosquitto\n", mid);
}
int main()
{
struct mosquitto *mosq = NULL;
const char *topic = "test";
int qos = 0;
const char *host = "localhost";
int port = 1883;
const char *payload_str = "{\"name\":\"John\", \"age\":30, \"city\":\"New York\"}";
struct json_object *payload = json_tokener_parse(payload_str);
const char *payload_formatted = json_object_to_json_string(payload);
mosquitto_lib_init();
mosq = mosquitto_new(NULL, true, NULL);
if (!mosq) {
fprintf(stderr, "Error: Out of memory.\n");
return 1;
}
mosquitto_connect_callback_set(mosq, on_connect);
mosquitto_publish_callback_set(mosq, on_publish);
if (mosquitto_connect(mosq, host, port, 60) != MOSQ_ERR_SUCCESS) {
fprintf(stderr, "Error: Could not connect to Mosquitto.\n");
mosquitto_disconnect(mosq);
mosquitto_destroy(mosq);
mosquitto_lib_cleanup();
return 1;
}
if (mosquitto_publish(mosq, NULL, topic, strlen(payload_formatted), payload_formatted, qos, false) != MOSQ_ERR_SUCCESS) {
fprintf(stderr, "Error: Could not publish message to Mosquitto.\n");
mosquitto_disconnect(mosq);
mosquitto_destroy(mosq);
mosquitto_lib_cleanup();
return 1;
}
mosquitto_disconnect(mosq);
mosquitto_destroy(mosq);
mosquitto_lib_cleanup();
return 0;
}
```
3. 编译程序
在终端中运行以下命令编译程序:
```
gcc -o program program.c -lmosquitto -ljson-c
```
4. 运行程序
在终端中运行以下命令运行程序:
```
./program
```
程序将连接到Mosquitto服务器,并将JSON数据发布到指定的主题。
请注意,以上示例代码仅用于演示目的,实际使用时需要根据实际情况进行修改和调整。
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