Crash on OTA when in-field

[Crispin]

hi folks,

I have an esp8266 which works fine in the house when building.
I can load new firmware via ota without issue when in the house.

When I move it to the garden, I struggle to load new firmware. It fails randomly between 1 and 100%. Sometimes it does work be very seldom.

RSSI in both cases is 60-70 (I have an outdoor AP which has good coverage).

Here is the stack trace.

Decoding stack results
0x4022ede6: ip4_output_if at core/ipv4/ip4.c line 1549
0x4022f943: ip_chksum_pseudo at core/inet_chksum.c line 392
0x4022a36a: tcp_output_control_segment at core/tcp_out.c line 1955
0x4022a1e9: tcp_output_alloc_header at core/tcp_out.c line 1863
0x4022ac00: tcp_send_empty_ack at core/tcp_out.c line 2058
0x4022ace7: tcp_output at core/tcp_out.c line 1319
0x40226d94: operator delete(void*, unsigned int) at /workdir/repo/gcc-gnu/libstdc++-v3/libsupc++/del_ops.cc line 33

Is there anything in there which I could be causing / solve?

Board is a Wemos Di Mini Pro 32MB.

[jhaine]

Is this via WiFi, or what? Assuming WiFi, is it using the same channel as your indoor AP? Is the indoor one 2.4GHz and the outdoor 5GHz? Maybe you have a neighbour using the same channel as the outdoor AP?

[Crispin]

Yes, wifi 2.4. No other signal is visible where weather station is. I live in rural countryside.

[jhaine]

A mystery then. Maybe the outdoor AP has a fault of some sort - could you try moving the indoor one outside temporarily to check?

[Crispin]

Don't want to speak too soon but I think I found it.

The other difference when in-field vs. on-bench? Anemometer was not connected.
That uses interrupts.

So I disabled the intterupt as soon as OTA started and enabled on finish / failure.

So far, loads of uploads without issue.

Seems an interrupt firing was enough to annoy the tcp handling.