Netconn drain issue

[mpulis]

Hi,

I've setup my ESP32 as a TCP server, receiving incoming data from a client. If I open the socket using a TCP/IP debug tool such as the Hercules Utility and attempt to transfer some bytes of data to the ESP32, then there is no issue.

When using a custom C# TCP Client to transfer data, if the connection is closed, the Client sends a TCP RST packet to the ESP32. This causes the below assertion, resetting the device.

Code: Select all

assertion "netconn marked closed" failed: file "C:/Users/mpulis/Desktop/Projects/ESP32/IDF4/msys32/home/esp-idf/components/lwip/lwip/src/api/api_msg.c", line 860, function: netconn_drain

I've tried this out on both the v4.1 and master branches with the same issue occurring in both. What is the cause of this?

I'm attaching a snapshot of the error (Capture.png) and a snapshot of the Wireshark logs when the crash occurs (Capture2.png). The ESP32 has IP address 192.168.0.23.