Re: Socket programming: send() function blocked

Hello Johnny, Thank you for the explanation. That's an important remark so I can continue the evaluation here. I was thinking that the issue was related to the MQTT library. But, in fact, there is something wrong with the TCP connection. I will post here as soon as I have more news. Best regard

Re: Socket programming: send() function blocked

Something is seriously wrong in your first run. Maybe a tcpdump would expose something, but basically, tcp_max_wrb_size should never be 0, but in your first run it appears to be. As that is the buffer size to use, you end up with a tcp connection with a buffer size of 0, so of course all write

Re: Socket programming: send() function blocked

I'm sorry ... I got the same behavior, but the send function now started to work non-blocking. Here is my situation: * I have 2 mqtt brokers (tcp servers) - one commercial (Tago.io) - one personal (Mosquitto) After a successful connection in both cases, the next step is to send the mqtt conn

Re: Socket programming: send() function blocked

Is there any chance that the broker didn't like the mqtt connect message and shutdown the connection and leaving my device alone ... all during send call? If the peer disconnects, the socket should be marked disconnected and the send() should fail with an error.

Re: Socket programming: send() function blocked

Is there any chance that the broker didn't like the mqtt connect message and shutdown the connection and leaving my device alone ... all during send call? Em sáb., 26 de jun. de 2021 às 11:42, Flavio Castro Alves Filho escreveu: > > Hello Greg, > > No. It was not set :-( > > I turned on the confi

Re: Socket programming: send() function blocked

Hello Greg, No. It was not set :-( I turned on the configuration, but the problem persisted. :-( Best regards, Flavio Em sáb., 26 de jun. de 2021 às 10:41, Gregory Nutt escreveu: > > Do you have CONFIG_NET_TCP_WRITE_BUFFERS=y selected? It is required for > TCP non-blocking send. > -- Flav

Re: Socket programming: send() function blocked

Do you have CONFIG_NET_TCP_WRITE_BUFFERS=y selected?  It is required for TCP non-blocking send.

Socket programming: send() function blocked

Hello, I am using the MQTT-C library (https://github.com/LiamBindle/MQTT-C) in my NuttX project and I am facing a quite interesting issue with a specific server. For a specific broker, which is a commercial one, after the connection is established, when the MQTT Connect message is sent, the firmw