在F103上移植MQTT的问题

xmlhttp

直接拿的LWIP扩展例程的网络实验8 NETCONN_TCP客户端这个修改的，连接服务器代码如下：
[mw_shl_code=applescript,true]
u8 mqtt_connect(void)
{
    MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
    unsigned char buf[200];
    int buflen = sizeof(buf);
    int len = 0;
    memset(buf,'\0',buflen);
    data.clientID.cstring = "STM32F103_TEST";
    data.keepAliveInterval = 20;     
    data.cleansession =0;
    data.username.cstring = "m1";
    data.password.cstring = "admin";
    data.MQTTVersion = 4;
    len = MQTTSerialize_connect(buf, buflen, &data);
    transport_sendPacketBuffer((char*)buf,len);
    delay_ms(100);
    if (MQTTPacket_read(buf, buflen, transport_getdata) == CONNACK)
    {
        unsigned char sessionPresent, connack_rc;
       if ( MQTTDeserialize_connack(&sessionPresent, &connack_rc, buf, buflen)!= 1 || connack_rc != 0)
        {
            printf("Unable to connect, return code %d\r\n", connack_rc);
            return 0;
        }
        else
        {
            printf("MQTT CONNECT!\r\n");
        }
    }
    else
        printf("No connack\r\n");
        return 0;
}
[/mw_shl_code]
在服务端有这样的日志输出：
1557404053: New client connected from x.x.x.x as STM32F103_TEST (p2, c0, k20, u'm1').
1557404053: No will message specified.
1557404053: Sending CONNACK to STM32F103_TEST (1, 0)

运行到MQTTDeserialize_connack(&sessionPresent, &connack_rc, buf, buflen)等于1，connack_rc=2
串口中打印 Unable to connect, return code 2，请问要怎么修改？

xmlhttp

运行 len = MQTTSerialize_connect(buf, buflen, &data);后buf的数据是：
10 25 00 04 4D 51 54 54 04 C0 00 14 00 0E 53 54 4D 33 32 46 31 30 33 5F 54 45 53 54 00 02 6D 31 00 05 61 64 6D 69 6E
运行if (MQTTPacket_read(buf, len, transport_getdata) == CONNACK)后的buf数据是：
20 20 20 02 01 00 54 54 04 C0 00 14 00 0E 53 54 4D 33 32 46 31 30 33 5F 54 45 53 54 00 02 6D 31 00 05 61 64 6D 69 6E

peng1554

帮顶~~

lemonvv

改写成这个试试看 data.cleansession =1;

郁郁葱葱

这个会不会和你的transport里面的接口函数有关？