TCP connections hopelessly unreliable.

[dmarkey]

Hi there,

I've tried using Sming and the Arduino spin for ESP8266 (and all SDK versiobns) and they all suffer very unreliable TCP connections.

Referenced bugs are here:

https://github.com/SmingHub/Sming/issues/198
https://github.com/SmingHub/Sming/issues/222

It seems TCP retransmissions aren't handled very well. Is there a bug here?

David

[dmarkey]

Does espressif need any more information to progress this high priority issue? Will I open a bug instead?

[eriksl]

I don't share this experience. TCP is fine. Maybe it's and issue with this "sming"?

[dmarkey]

I have the same problem with the arduino ESP8266 port. Specifically to my VPS @ dmarkey.com

[ESP_Faye]

Hi,

Please have a try with our latest esp_iot_sdk_v1.4.0.

We optimized TCP to make the connection more reliable in sdk_v1.4.0.

Thanks for your interest in ESP8266 !

[dmarkey]

I've tried with 1.4. It's improved but random disconnections still occur.

[ESP_Faye]

Hi,

Bad network environment may cause "random disconnections".

Or you can capture the WiFi packets for debugging.

Thanks for your interest in ESP8266 !

[dmarkey]

What kind of traces are you looking for?

A tcpdump race can be found here: https://github.com/SmingHub/Sming/issues/222

[ESP_Faye]

Hi,

Please capture the WiFi network packets by "wireshark" or "omnipeek" when the disconnection happen.

We will analyse the packets for debugging.

Thanks for your interest in ESP8266 !

[MikeBolton]

We too are having a problem with the TCP. This is with incoming messages - from a Smartphone app. As this is a control application we need the message to be sent via the UART as soon as possible. We have a reliable connection to the TCP channel but the messages appear on the UART with a very variable delay and sometimes not at all. Much of the time the delay is small (we only send at about one second intervals, one message of a few bytes at a time) but quite often we get no output and then a burst of the 'missing' messages. Sometimes we get no UART output at all. (No blue LED). This is no use for critical 'real time' control from the Smartphone to the system.

Have others experienced this problem and are there any ways round it?

Mike Bolton