Error: ClientSendTask can't send a packet to the client

[skireichev]

Hello. I have some problem with mqtt-sn gateway. Log + settings attached.

20190603 144116.313 CONNECT <--- 11 04 00 01 03 84 00 09 55 4D 33 31 53 4D 41 52 54 20190603 144116.366 CONNECT ===> 10 51 00 04 4D 51 54 54 04 C0 03 84 00 01 2A 00 40 66 4A 52 32 42 35 71 46 4F 38 48 30 33 57 32 6A 45 33 48 74 65 6C 59 73 63 50 6E 31 37 61 6A 61 4A 31 32 61 55 68 45 77 64 39 6D 36 54 66 64 6E 36 4B 46 39 54 74 70 57 36 43 4C 33 43 56 34 39 00 00 20190603 144116.447 CONNACK <=== 20 02 01 00 20190603 144116.447 CONNACK ---> 03 05 00 Error: ClientSendTask can't send a packet to the client *.

BrokerName=mqtt.flespi.io BrokerPortNo=1883 BrokerSecurePortNo=8883 ClientAuthentication=NO AggregatingGateway=NO QoS-1=NO Forwarder=NO

ClientsList=/path/to/your_clients.conf

PredefinedTopic=NO

PredefinedTopicList=/path/to/your_predefinedTopic.conf

RootCAfile=/etc/ssl/certs/ca-certificates.crt

RootCApath=/etc/ssl/certs/

CertsFile=/path/to/certKey.pem

PrivateKey=/path/to/privateKey.pem

GatewayID=1 GatewayName=PahoGateway-01 KeepAlive=900 LoginID=someprivateid Password=

UDP

GatewayPortNo=10000 MulticastIP=225.1.1.1 MulticastPortNo=1883

XBee

Baudrate=38400 SerialDevice=/dev/ttyUSB0 ApiMode=2

LOG

ShearedMemory=NO;

[ty4tw]

'*' is not allowed as ClientId. Only Alpha Numeric are allowed. Check the Specifications of MQTT-SN and MQTT.

[skireichev]

Thanks. Connect message was wrong. CliendID was written in MQTT style : length + data. Now clientID = 55 4D 33 31 53 4D 41 52 54 (only alpha numeric) But error persists.

20190604 111019.244 CONNECT <--- 0F 04 04 01 03 84 55 4D 33 31 53 4D 41 52 54 20190604 111019.298 CONNECT ===> 10 51 00 04 4D 51 54 54 04 C2 03 84 00 01 2A 00 40 66 4A 52 32 42 35 71 46 4F 38 48 30 33 57 32 6A 45 33 48 74 65 6C 59 73 63 50 6E 31 37 61 6A 61 4A 31 32 61 55 68 45 77 64 39 6D 36 54 66 64 6E 36 4B 46 39 54 74 70 57 36 43 4C 33 43 56 34 39 00 00 20190604 111019.673 CONNACK <=== 20 02 00 00 20190604 111019.673 CONNACK ---> 03 05 00 Error: ClientSendTask can't send a packet to the client *.

[ty4tw]

CliendID is not written in MQTT style. Just data without length.

5.4.4 CONNECT
 ClientId: same as with MQTT, contains the client id which is a 1-23 character
long string which uniquely identifies the client to the server.

Unlike MQTT, the length of the client Id is explicitly obtained from Message length.　　　

5.3.1 ClientId  
 A with MQTT, the ClientId field has a variable length and contains a 1-23 
character string.   

Explanation is not correct.
The specification is ambiguous about this.

[skireichev]

There are two logs in posts 1 and 3, with different clientID ( post 1 - length + clienID, post 3 - clientID only). I get an error anyway.

Add:Use transparent mode, without clients list (device with NB-IoT modem, UDP only).

[ty4tw]

GW can't send a packet by some reason. Can you try the code as follows to get the reason?

MQTTSNGWClientSendTask.cpp line 76.

        if ( rc < 0 )
        {
            WRITELOG("%s ClientSendTask can't send a packet to the client %s. Error=%d%s\n",
                ERRMSG_HEADER, (client ? (const char*)client->getClientId() : UNKNOWNCL ), rc, ERRMSG_FOOTER);
        }
        delete ev;
    }
}

[skireichev]

Add error message. Result:

Error: ClientSendTask can't send a packet to the client *. Error=-1

[ty4tw]

errno should be taken, sorry. Add #include and change rc to errno. Thank you.

[skireichev]

Done.

Error: ClientSendTask can't send a packet to the client *. Error=22

[ty4tw]

Errno 22 is Invalid Argument.

Compile the GW with make argument -DDEBUG_NWSTACK to activate D_NWSTACK() function. $ make -DDEBUG_NWSTACK

int UDPPort::unicast(const uint8_t* buf, uint32_t length, SensorNetAddress* addr)
{
    sockaddr_in dest;
    dest.sin_family = AF_INET;
    dest.sin_port = addr->getPortNo();
    dest.sin_addr.s_addr = addr->getIpAddress();

    int status = ::sendto(_sockfdUnicast, buf, length, 0, (const sockaddr*) &dest, sizeof(dest));
    if (status < 0)
    {
        D_NWSTACK("errno == %d in UDPPort::sendto\n", errno);
    }
    D_NWSTACK("sendto %s:%u length = %d\n", inet_ntoa(dest.sin_addr), ntohs(dest.sin_port), status);
    return status;
}

[Hamilton-Dias]

I got the same error while working the Paho Gateway.

The error was that my client was connecting to the gateway with the port 1883, while the corrent one is 10000.

[ty4tw]

Hi Hamulton, Thank you for kind information. I am going to close this issue if there is no more responsein near future.