EMS/kit/kit_mqtt_sub.c

#include "kit_mqtt_sub.h"

#define ADDRESS     "tcp://47.120.14.45:3011"
#define CLIENTID    "ExampleClientSub"
#define TOPIC       "aa"
#define PAYLOAD     "Hello World!"
#define QOS         1
#define TIMEOUT     10000L

int disc_finished = 0;
int subscribed = 0;
int finished1 = 0;

void connlost1(void *context, char *cause)
{
	MQTTAsync client = (MQTTAsync)context;
	MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
	int rc;

	printf("\nConnection lost\n");
	if (cause)
		printf("     cause: %s\n", cause);

	printf("Reconnecting\n");
	conn_opts.keepAliveInterval = 20;
	conn_opts.cleansession = 1;
	conn_opts.onSuccess = onConnect1;
	conn_opts.onFailure = onConnectFailure1;
	if ((rc = MQTTAsync_connect(client, &conn_opts)) != MQTTASYNC_SUCCESS)
	{
		printf("Failed to start connect, return code %d\n", rc);
		finished1 = 1;
	}
}


int msgarrvd(void *context, char *topicName, int topicLen, MQTTAsync_message *message)
{
    //解析MQTT的json格式
    // 将payload转换为C字符串，并确保为其分配足够的空间
    char* payload_str = (char*)malloc(message->payloadlen + 1);
    if (payload_str) {
        memcpy(payload_str, message->payload, message->payloadlen);
        payload_str[message->payloadlen] = '\0'; // 确保字符串以空字符结尾
        cJSON *json = cJSON_Parse(payload_str);
        if (json == NULL) {
            // 处理解析错误
            const char *error_ptr = cJSON_GetErrorPtr();
            if (error_ptr != NULL) {
                fprintf(stderr, "Error before: %s\n", error_ptr);
            }
        } else {
            // 成功解析，访问对象
            const char *name = cJSON_GetStringValue(cJSON_GetObjectItem(json, "msg"));
            if (name) {
                printf("解析后的json格式：msg: %s\n", name);
            }
            cJSON_Delete(json);
        }
        free(payload_str);
    }

    printf("Message arrived\n");
    printf("     topic: %s\n", topicName);
    printf("   message: %.*s\n", message->payloadlen, (char*)message->payload);
    MQTTAsync_freeMessage(&message);
    MQTTAsync_free(topicName);
    return 1;
}

void onDisconnectFailure1(void* context, MQTTAsync_failureData* response)
{
	printf("Disconnect failed, rc %d\n", response->code);
	disc_finished = 1;
}

void onDisconnect1(void* context, MQTTAsync_successData* response)
{
	printf("Successful disconnection\n");
	disc_finished = 1;
}

void onSubscribe(void* context, MQTTAsync_successData* response)
{
	printf("Subscribe succeeded\n");
	subscribed = 1;
}

void onSubscribeFailure(void* context, MQTTAsync_failureData* response)
{
	printf("Subscribe failed, rc %d\n", response->code);
	finished1= 1;
}


void onConnectFailure1(void* context, MQTTAsync_failureData* response)
{
	printf("Connect failed, rc %d\n", response->code);
	finished1 = 1;
}


void onConnect1(void* context, MQTTAsync_successData* response)
{
	MQTTAsync client = (MQTTAsync)context;
	MQTTAsync_responseOptions opts = MQTTAsync_responseOptions_initializer;
	int rc;

	printf("Successful connection\n");

	printf("Subscribing to topic %s\nfor client %s using QoS%d\n\n"
           "Press Q<Enter> to quit\n\n", TOPIC, CLIENTID, QOS);
	opts.onSuccess = onSubscribe;
	opts.onFailure = onSubscribeFailure;
	opts.context = client;
	if ((rc = MQTTAsync_subscribe(client, TOPIC, QOS, &opts)) != MQTTASYNC_SUCCESS)
	{
		printf("Failed to start subscribe, return code %d\n", rc);
		finished1 = 1;
	}
}


int subClient()
{
	MQTTAsync client;
	MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
	MQTTAsync_disconnectOptions disc_opts = MQTTAsync_disconnectOptions_initializer;
	int rc;
	int ch;

	if ((rc = MQTTAsync_create(&client, ADDRESS, CLIENTID, MQTTCLIENT_PERSISTENCE_NONE, NULL))
			!= MQTTASYNC_SUCCESS)
	{
		printf("Failed to create client, return code %d\n", rc);
		rc = EXIT_FAILURE;
		goto exit;
	}
    else{
        printf("create success\n");
    }

	if ((rc = MQTTAsync_setCallbacks(client, client, connlost1, msgarrvd, NULL)) != MQTTASYNC_SUCCESS)
	{
		printf("Failed to set callbacks, return code %d\n", rc);
		rc = EXIT_FAILURE;
		goto destroy_exit;
	}

	conn_opts.keepAliveInterval = 20;
	conn_opts.cleansession = 1;
	conn_opts.onSuccess = onConnect1;
	conn_opts.onFailure = onConnectFailure1;
	conn_opts.context = client;
	if ((rc = MQTTAsync_connect(client, &conn_opts)) != MQTTASYNC_SUCCESS)
	{
		printf("Failed to start connect, return code %d\n", rc);
		rc = EXIT_FAILURE;
		goto destroy_exit;
	}
    else{
        printf("connect successful\n");
    }

	while (!subscribed && !finished1)
	{
        sleep(1);
    }

	if (finished1)
		goto exit;

	do 
	{
		ch = getchar();
	} while (ch!='Q' && ch != 'q');

	disc_opts.onSuccess = onDisconnect1;
	disc_opts.onFailure = onDisconnectFailure1;
	if ((rc = MQTTAsync_disconnect(client, &disc_opts)) != MQTTASYNC_SUCCESS)
	{
		printf("Failed to start disconnect, return code %d\n", rc);
		rc = EXIT_FAILURE;
		goto destroy_exit;
	}
 	while (!disc_finished)
 	{
		sleep(1);
 	}

destroy_exit:
	MQTTAsync_destroy(&client);
exit:
 	return rc;
}