ESP8266 Community Forum

Posted: **Mon Jan 23, 2017 5:19 am**

I reduced your code to a simple tcp open/close - test:

void loop()
{
  WiFiClient client;

  client.connect(host, 80);
  client.stop();
}

I don`t know a reason why this is crashing after a few seconds (~30s) ? Possibly someone else can help us ?

Posted: **Mon Jan 23, 2017 5:46 am**

Try to print out heap size after each .stop() . Maybe it's because of TCP_TIME_WAIT state... Does .stop() do abort or close TCP connection?

Posted: **Mon Jan 23, 2017 10:35 am**

Hi pablo,
I assumed the TIME_WAIT problem too and already did a netstat-a on my server ... but the number of connections in TIME_WAIT status was not so high.

But you are right ... the heap decreases in every round :

Code: Select all

2344
2160
2096
1792
1608
1424
1360
1056
992
808
504
440
136
Exception (29):
epc1=0x4000e1c3 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000018 depc=0x00000000

ctx: sys 
sp: 3ffffc80 end: 3fffffb0 offset: 01a0

>>>stack>>>
3ffffe20:  4010235d 3ffec758 3ffed8a0 00000014  
3ffffe30:  4020db01 4020da3e 3fff036c 401024ec  
3ffffe40:  00000018 3ffed1a8 3ffed124 00000000  
3ffffe50:  4020db9c 3ff20a00 3fff036c 3ffe95e6  
3ffffe60:  3ffe95cc 3ffe9570 3ffe9570 3ffe95cc

Do you have an idea about what happens here ?

Posted: **Mon Jan 23, 2017 11:09 am**

Hmm, I'm not sure, but try to move WiFiClient client; to global section (probably this will not help, but confirms that there is something inside tcp stack left on heap). Then replace .stop() with abort() from ClientContext class. Maybe this help...

ESP8266 Community Forum

HelloServer causes Exception

Re: HelloServer causes Exception

Re: HelloServer causes Exception

Re: HelloServer causes Exception

Re: HelloServer causes Exception