UDP connected socket, any obvious omission?

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#UDP connected socket, any obvious omission?

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davidg238 10/07/2022 06:32 PM

I am attempting to connect to the rsmb MQTT-SN broker. In my client, I have setup code:

constructor --.gateway --.port=1885:

  open -> none:
    network = net.open
    udp_socket = network.udp_open
    server_address = net.SocketAddress (net.IpAddress.parse gateway) port
    udp_socket.connect server_address

and where I send the payload

send_ payload/ByteArray -> none:
    msg := udp.Datagram payload server_address
    udp_socket.send msg
    packet_id++

On the server log, I see CWNAN0075W Socket error 107 (Transport endpoint is not connected) in getpeername for socket 4
This is reported, running the client on either host or device.
Is there any obvious error you see in the snippets above?

floitsch 10/07/2022 11:15 PM

@erikcorry_arbat

any ideas?

davidg238 10/08/2022 01:26 AM

Thx. Found a simple C test case (for QOS -1) in Eclipse Paho, rsmb broker responds correctly to that. The udp_socket.connect is unnecessary. Same behavior when removed. Will use Wireshark, expect then I formatted the packet incorrectly.(edited)

davidg238 10/08/2022 08:27 PM

Fixed. Badly formatted flag field in the MQTT-SN packet, but strange rsmbroker reported Socket error 107

4 messages in total