ESP8266 Developer Zone

Re: TCP connections hopelessly unreliable.

2015-10-31T03:54:21+08:00

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

Statistics: Posted by MikeBolton — Sat Oct 31, 2015 3:54 am

Re: TCP connections hopelessly unreliable.

2015-10-20T09:43:05+08:00

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 !

Statistics: Posted by ESP_Faye — Tue Oct 20, 2015 9:43 am

Re: TCP connections hopelessly unreliable.

2015-10-19T18:35:50+08:00

What kind of traces are you looking for?

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

Statistics: Posted by dmarkey — Mon Oct 19, 2015 6:35 pm

Re: TCP connections hopelessly unreliable.

2015-10-19T10:46:18+08:00

Hi,

Bad network environment may cause "random disconnections".

Or you can capture the WiFi packets for debugging.

Thanks for your interest in ESP8266 !

Statistics: Posted by ESP_Faye — Mon Oct 19, 2015 10:46 am

Re: TCP connections hopelessly unreliable.

2015-10-16T17:15:59+08:00

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

Statistics: Posted by dmarkey — Fri Oct 16, 2015 5:15 pm

Re: TCP connections hopelessly unreliable.

2015-10-16T09:49:07+08:00

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 !

Statistics: Posted by ESP_Faye — Fri Oct 16, 2015 9:49 am

Re: TCP connections hopelessly unreliable.

2015-10-15T20:46:19+08:00

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

Statistics: Posted by dmarkey — Thu Oct 15, 2015 8:46 pm

Re: TCP connections hopelessly unreliable.

2015-10-15T16:01:01+08:00

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

Statistics: Posted by eriksl — Thu Oct 15, 2015 4:01 pm

Re: TCP connections hopelessly unreliable.

2015-10-14T20:10:06+08:00

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

Statistics: Posted by dmarkey — Wed Oct 14, 2015 8:10 pm

TCP connections hopelessly unreliable.

2015-10-13T00:38:00+08:00

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

Statistics: Posted by dmarkey — Tue Oct 13, 2015 12:38 am