Vajnar opened a new issue, #19137: URL: https://github.com/apache/nuttx/issues/19137
### Description During development of a TCP application, I stumbled across intermittent network failures. After some time the network activity is interrupted for approximately 1 minute and is resumed afterwards. I can see re-transmit attempts from my PC (10.0.0.2) to the ESP32C6 (10.0.0.1), but no ACK is produced by the ESP32 during the outage. The code on the ESP32C6 still runs during the outage as I can see timeouts of `ppoll()` waiting for input data being reported on serial console. See below printscreen of one such session. <img width="2050" height="1210" alt="Image" src="https://github.com/user-attachments/assets/82f8e212-f0b4-461b-8d96-cd18d811032c"; /> Application is fairly simple for demonstrative purposes. There is a server part which accepts connection from PC running the client code. After connection is established, client sends ping command and expects same response from server. (In hex the command is 0xfa1a00), then client waits 2 seconds and repeats the cycle. On server side there is `ppoll()` which waits for input data from client. I'm not sure where the problem comes from. If it is some issue with configuring the TCP stack or if there is an issue in NuttX. The code to reproduce the issue is on [github.com](https://github.com/Vajnar/nuttx-apps/tree/broken-network/examples/broken-network) and [here](https://github.com/Vajnar/nuttx/blob/broken-network/boards/risc-v/esp32c6/esp32c6-devkitc/configs/broken-network/defconfig) is the `defconfig` which I'm using. If need be, I can provide complete PCAP and logs from one such attempt. cc: @ppisa ### Verification - [x] I have verified before submitting the report. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
