sdk-ameba-v4.0c_180328/component/common/example/mqtt/example_mqtt.c

/* Standard includes. */
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"

#include "MQTTClient.h"
#include "wifi_conf.h"

#define MQTT_SELECT_TIMEOUT 1
void messageArrived(MessageData* data)
{
	mqtt_printf(MQTT_INFO, "Message arrived on topic %.*s: %.*s\n", data->topicName->lenstring.len, data->topicName->lenstring.data,
		data->message->payloadlen, (char*)data->message->payload);
}

//This example is original and cannot restart if failed. To use this example, define WAIT_FOR_ACK and not define MQTT_TASK in MQTTClient.h
static void prvMQTTEchoTask(void *pvParameters)
{
	/* connect to gpssensor.ddns.net, subscribe to a topic, send and receive messages regularly every 5 sec */
	MQTTClient client;
	Network network;
	unsigned char sendbuf[512], readbuf[80];
	int rc = 0, count = 0;
	MQTTPacket_connectData connectData = MQTTPacket_connectData_initializer;
	char* address = "gpssensor.ddns.net";
	char* sub_topic = "LASS/Test/Pm25Ameba/#";
	char* pub_topic = "LASS/Test/Pm25Ameba/FT1_018";
	
	NetworkInit(&network);
	MQTTClientInit(&client, &network, 30000, sendbuf, sizeof(sendbuf), readbuf, sizeof(readbuf));

	mqtt_printf(MQTT_INFO, "Wait Wi-Fi to be connected.");
	while(wifi_is_ready_to_transceive(RTW_STA_INTERFACE) != RTW_SUCCESS) {
		vTaskDelay(5000 / portTICK_PERIOD_MS);
	}
	mqtt_printf(MQTT_INFO, "Wi-Fi connected.");
	
	mqtt_printf(MQTT_INFO, "Connect Network \"%s\"", address);
	while ((rc = NetworkConnect(&network, address, 1883)) != 0){
		mqtt_printf(MQTT_INFO, "Return code from network connect is %d\n", rc);
		vTaskDelay(1000 / portTICK_PERIOD_MS);
	}
	mqtt_printf(MQTT_INFO, "\"%s\" Connected", address);

	connectData.MQTTVersion = 3;
	connectData.clientID.cstring = "FT1_018";

	mqtt_printf(MQTT_INFO, "Start MQTT connection");
	while ((rc = MQTTConnect(&client, &connectData)) != 0){
		mqtt_printf(MQTT_INFO, "Return code from MQTT connect is %d\n", rc);
		vTaskDelay(1000 / portTICK_PERIOD_MS);
	}
	mqtt_printf(MQTT_INFO, "MQTT Connected");

	mqtt_printf(MQTT_INFO, "Subscribe to Topic: %s", sub_topic);
	if ((rc = MQTTSubscribe(&client, sub_topic, QOS2, messageArrived)) != 0) 
		mqtt_printf(MQTT_INFO, "Return code from MQTT subscribe is %d\n", rc);

	mqtt_printf(MQTT_INFO, "Publish Topics: %s", pub_topic);
	while (++count)
	{
		MQTTMessage message;
		char payload[300];

		message.qos = QOS1;
		message.retained = 0;
		message.payload = payload;
		sprintf(payload, "hello from AMEBA %d", count);
		message.payloadlen = strlen(payload);

		if ((rc = MQTTPublish(&client, pub_topic, &message)) != 0)
			mqtt_printf(MQTT_INFO,"Return code from MQTT publish is %d\n", rc);
		if ((rc = MQTTYield(&client, 1000)) != 0)
			mqtt_printf(MQTT_INFO,"Return code from yield is %d\n", rc);
		vTaskDelay(5000);
	}
	/* do not return */
}

#if defined(MQTT_TASK)
void MQTTPublishMessage(MQTTClient* c, char *topic)
{	
	int rc = 0;
	static int count = 0;
	MQTTMessage message;
	char payload[300];
	message.qos = QOS1;
	message.retained = 0;		
	message.payload = payload;
	
	if(c->mqttstatus == MQTT_RUNNING){
		count++;
		sprintf(payload, "hello from AMEBA %d", count);
		message.payloadlen = strlen(payload);			
		mqtt_printf(MQTT_INFO, "Publish Topic %s : %d", topic, count);
		if ((rc = MQTTPublish(c, topic, &message)) != 0){
			mqtt_printf(MQTT_INFO, "Return code from MQTT publish is %d\n", rc);
			MQTTSetStatus(c, MQTT_START);
			c->ipstack->disconnect(c->ipstack);
		}
	}

}

static void prvMQTTTask(void *pvParameters)
{
	MQTTClient client;
	Network network;
	static unsigned char sendbuf[MQTT_SENDBUF_LEN], readbuf[MQTT_READBUF_LEN];
	int rc = 0, mqtt_pub_count = 0;
	MQTTPacket_connectData connectData = MQTTPacket_connectData_initializer;
	connectData.MQTTVersion = 3;
	connectData.clientID.cstring = "FT1_018";
	char* address = "gpssensor.ddns.net";
	char* sub_topic = "LASS/Test/Pm25Ameba/#";
	char* pub_topic = "LASS/Test/Pm25Ameba/FT1_018";

	NetworkInit(&network);
	MQTTClientInit(&client, &network, 30000, sendbuf, sizeof(sendbuf), readbuf, sizeof(readbuf));

	while (1)
	{	
		while(wifi_is_ready_to_transceive(RTW_STA_INTERFACE) != RTW_SUCCESS) {
			mqtt_printf(MQTT_INFO, "Wait Wi-Fi to be connected.");
			vTaskDelay(5000 / portTICK_PERIOD_MS);
		}

		fd_set read_fds;
		fd_set except_fds;
		struct timeval timeout;

		FD_ZERO(&read_fds);
		FD_ZERO(&except_fds);
		timeout.tv_sec = MQTT_SELECT_TIMEOUT;
		timeout.tv_usec = 0;

		if(network.my_socket >= 0){
			FD_SET(network.my_socket, &read_fds);
			FD_SET(network.my_socket, &except_fds);
			rc = FreeRTOS_Select(network.my_socket + 1, &read_fds, NULL, &except_fds, &timeout);
			
			if(FD_ISSET(network.my_socket, &except_fds))
			{
				mqtt_printf(MQTT_INFO, "except_fds is set");
				MQTTSetStatus(&client, MQTT_START); //my_socket will be close and reopen in MQTTDataHandle if STATUS set to MQTT_START
			}
			else if(rc == 0) //select timeout
			{
				if(++mqtt_pub_count == 5) //Send MQTT publish message every 5 seconds
				{
					MQTTPublishMessage(&client, pub_topic);
					mqtt_pub_count = 0;
				}
			}
		}
		MQTTDataHandle(&client, &read_fds, &connectData, messageArrived, address, sub_topic);
	}
}
#endif

void vStartMQTTTasks(uint16_t usTaskStackSize, UBaseType_t uxTaskPriority)
{
	BaseType_t x = 0L;

#if defined(MQTT_TASK)
	xTaskCreate(prvMQTTTask,	/* The function that implements the task. */
			"MQTTTask",			/* Just a text name for the task to aid debugging. */
			usTaskStackSize,	/* The stack size is defined in FreeRTOSIPConfig.h. */
			(void *)x,		/* The task parameter, not used in this case. */
			uxTaskPriority,		/* The priority assigned to the task is defined in FreeRTOSConfig.h. */
			NULL);				/* The task handle is not used. */
#else
	xTaskCreate(prvMQTTEchoTask,	/* The function that implements the task. */
			"MQTTEcho0",			/* Just a text name for the task to aid debugging. */
			usTaskStackSize + 128,	/* The stack size is defined in FreeRTOSIPConfig.h. */
			(void *)x,		/* The task parameter, not used in this case. */
			uxTaskPriority,		/* The priority assigned to the task is defined in FreeRTOSConfig.h. */
			NULL);				/* The task handle is not used. */
#endif

}

void example_mqtt(void)
{	
	vStartMQTTTasks(4096, tskIDLE_PRIORITY + 4);
}
/*-----------------------------------------------------------*/