incubator_embeded/MQTT/mqtt_api.c

#include "mqtt_api.h"
#include "MQTTPacket.h"
#include <stdlib.h>
#include <stdint.h>
#include <string.h>

char *mqttClientId="Device1|securemode=3,signmethod=hmacsha1|";
int 	keepalive=180;
int 	cleansession=1;
char *mqttUsername="Device1&hp8oQhMZJ67";
char *password="EB0DC81620DA35DA9C31BDE6B5339418FCE54E15";

uint8 buf[1024]={0};
int buflen = sizeof(buf);

/******解析收到的ACK报文*********/
int mqtt_decode_msg(unsigned char*buf)
{
	int rc = -1;
	MQTTHeader header = {0};
	header.byte = buf[0];
	rc = header.bits.type;
	return rc;
}

//连接MQTT服务器函数
uint8 connectMqtt(SOCKET Socket){
	int len,rc,wait_ack_time=0;
	MQTTPacket_connectData data = MQTTPacket_connectData_initializer;//配置部分可变头部的值
	data.clientID.cstring = mqttClientId;		//客户端标识，用于区分每个客户端
	data.keepAliveInterval = keepalive;			//保活计时器，定义了服务器收到客户端消息的最大时间间隔
	data.cleansession = cleansession;				//该标志置1服务器必须丢弃之前保持的客户端的信息，将该连接视为“不存在”
	data.username.cstring = mqttUsername;
	data.password.cstring = password;
	memset(buf,0,buflen);
	len = MQTTSerialize_connect(buf, buflen, &data); 	/*1 构造连接报文*/
	rc = send(Socket,buf,len);												//发送连接请求
	if(rc != len)
	{
		printf("Send Connect Error: rc=%d len=%d\n\r",rc,len);
		return 1;
	}
	//循环获取Connect Ack
	do{
		delay_ms(10);
		len=getSn_RX_RSR(Socket);	
		wait_ack_time++;
		if(wait_ack_time>MAX_OVERTIME)
		{
			printf("Wait CONNACK Overtime\n\r");
			return 2;
		}
	}while(len<=0);
	recv(Socket,buf,len);//接收数据 判断是否为Connect Ack
	if(mqtt_decode_msg(buf)!=CONNACK){
		printf("Error CONNACK:%s\n\r",buf);
		return 3;
	}
	printf("Connect Is Ok:%s\r\n",buf);
	return 0;
}

//PING服务器 保持存活
uint8 pingMqtt(SOCKET Socket){
	int len,rc,wait_ack_time=0;
	memset(buf,0,buflen);
	len=MQTTSerialize_pingreq(buf,buflen);
	rc=send(Socket,buf, len);
	if(len!=rc)
	{
		printf("Send Ping Error: rc=%d len=%d\n\r",rc,len);
		return 1;
	}
	do{
		delay_ms(10);
		len=getSn_RX_RSR(Socket);
		wait_ack_time++;
		if(wait_ack_time>MAX_OVERTIME)
		{
			printf("Wait PINGRESP Overtime\n\r");
			return 2;
		}
	}while(len<=0);
	recv(Socket,buf,len);
	if(mqtt_decode_msg(buf) != PINGRESP){
		printf("Error PINGRESP:%s\n\r",buf);
		return 3;
	}
	printf("PING Successfully:%s\n\r",buf);
//	if(len>2){
//		if(mqtt_decode_msg(buf+2) == PUBLISH){
//			dealMqtt(Socket,buf+2,buflen-2);
//		}
//	}
	return 0;
}

//MQTT发布消息函数
uint8 publishMqtt(SOCKET Socket,char *pTopic,char *pMessage)
{
	int len,rc,wait_ack_time=0;
	MQTTString topicString = MQTTString_initializer;
	int msglen = strlen(pMessage);//计算发布消息的长度
	memset(buf,0,buflen);
	topicString.cstring = pTopic;
	len = MQTTSerialize_publish(buf, buflen, 0, 1, 0, 0, topicString, (unsigned char*)pMessage, msglen); /*2 构造发布消息的报文*/
	rc = send(Socket,buf,len);		//发送消息
	if (rc != len)
	{
		printf("Send Publish Error: rc=%d len=%d\n\r",rc,len);
		return 1;
	}
	do{
		delay_ms(10);
		len=getSn_RX_RSR(Socket);
		wait_ack_time++;
		if(wait_ack_time>MAX_OVERTIME)
		{
			printf("Wait PUBACK Overtime\n\r");
			return 2;
		}
	}while(len<=0);
	recv(Socket,buf,len);
	if(mqtt_decode_msg(buf) != PUBACK){
		printf("error PUBACK:%s\n\r",buf);
		return 3;
	}
	printf("Publish Successfully:%s\n\r",buf);
	return 0;
}
//MQTT订阅函数
uint8 subscribMqtt(SOCKET Socket,char *pTopic)
{
	int len,rc,wait_ack_time=0;
	MQTTString topicString = MQTTString_initializer;
	int msgid = 1;							//该值为消息标识符
	int req_qos = 1;
	memset(buf,0,buflen);
	topicString.cstring = pTopic;
	len = MQTTSerialize_subscribe(buf, buflen, 0, msgid, 1, &topicString, &req_qos);//构造订阅主题报文
	rc = send(Socket,buf,len);	//发送消息
	if (rc != len)
	{
		printf("Send Subscrib Error: rc=%d len=%d\n\r",rc,len);
		return 1;
	}
	do{
		delay_ms(10);
		len=getSn_RX_RSR(Socket);
		wait_ack_time++;
		if(wait_ack_time>MAX_OVERTIME)
		{
			printf("Wait SUBACK Overtime\n\r");
			return 2;
		}
	}while(len<=0);
	recv(Socket,buf,len);
	if(mqtt_decode_msg(buf) != SUBACK){
		printf("Error SUBACK:%s\n\r",buf);
		return 3;
	}
	printf("Subscrib Successfully:%s\n\r",buf);
	return 0;
}

//MQTT处理订阅消息函数
void dealPublish(SOCKET Socket,uint8 *msgbuf,uint16 msglen){
	//////////获取订阅消息参数//////////////
	unsigned char dup;
	int qos;
	unsigned char retained;
	unsigned short mssageid;
	int payloadlen_in;
	unsigned char* payload_in;
	MQTTString receivedTopic;
	/////////////////////////////////////////
	int len,rc;
	MQTTDeserialize_publish(&dup, &qos, &retained, &mssageid, &receivedTopic,
							&payload_in, &payloadlen_in, msgbuf, msglen);
	printf("message id: %d\n\r",mssageid);
	printf("message qos: %d\n\r",qos);
	printf("message receivedTopic: %s\n\r",receivedTopic.lenstring.data);
	printf("message arrived[%d]: %s\n\r", payloadlen_in, payload_in);
	if(qos>0){//需要回复
		len = MQTTSerialize_puback(buf, buflen, mssageid);//构造ack报文
		rc = send(Socket,buf,len);	//发送消息
		if(len!=rc)printf("Send PUBACK Error: rc=%d len=%d\n\r",rc,len);
	}
}

uint8 do_mqtt(SOCKET Socket,uint8 *sip,uint16 sport,uint16 lport){  //sport源端口 lport本地端口
	static uint8 CONNECT_FLAG = 0;
	uint16 rlen;
	switch(getSn_SR(Socket)){		// get socket status
		 case SOCK_INIT://init state 
			 connect(Socket,sip,sport);//此函数以活动(客户端)模式为通道建立连接。这个函数会一直等待，直到连接建立。
			 break;
		 case SOCK_ESTABLISHED:		//success to connect 
			 if(getSn_IR(Socket)&Sn_IR_CON)setSn_IR(Socket,Sn_IR_CON);//getSn_IR，获取Socket中断状态；Sn_IR_CON，已建立连接
			 if(!CONNECT_FLAG)if(!connectMqtt(Socket))CONNECT_FLAG=1;//connectMqtt（）连接服务器；
			 printf("success connect aliyun!!!\r\n");
			 rlen=getSn_RX_RSR(Socket);//获取socketRX接收大小
			 if(rlen>0){
					recv(Socket,buf,rlen);
					switch(mqtt_decode_msg(buf)){//解析收到的ACK报文
						case PUBLISH:
							dealPublish(Socket,buf,rlen);
						break;
						default:
							printf("recv:%s",buf);
						break;
					}
			 }
			 break;
		 case SOCK_CLOSE_WAIT:
				disconnect(Socket);
				close(Socket);
			 break;
		 case SOCK_CLOSED:
				CONNECT_FLAG=0;
				socket(Socket,Sn_MR_TCP,lport,Sn_MR_ND);
			 break;
	 }
	return CONNECT_FLAG;
}