Pico-W to Pico-W STALL while sending UDP - Githubissues

raspberrypi / pico-examples

BSD 3-Clause "New" or "Revised" License

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Pico-W to Pico-W STALL while sending UDP #479

Closed marcos-diaz closed 6 months ago

marcos-diaz commented 6 months ago

Steps to reproduce:

In the host Pico-W load Pico-W AP example.
In the second Pico-W load Pico-W UDP beacon example.
Run both Picos and make them connect to each other.
- In the AP code change ap_name and ap_password.
- Pass WIFI_SSID and WIFI_PASSWORD while compiling to match these.
For more chances of this bug appearing faster, decrease BEACON_INTERVAL_MS to 100 or even 10.

Expected results:

UDP packets keep being sent (and ignored), for as long as the Picos are running.

Actual results:

UDP packets are sent for a few seconds.
Eventually (at what seems to be completely random time), the sender Pico will start throwing errors such as:
```
STALL(0;45-45): timeout
[CYW43] send_ethernet failed: -1
Failed to send UDP packet! error=-12
```
The CYW43 becomes increasely unresponsive, until it completely stall, and never recovers.

Special notes:

Funny enough it seems these Picos do their work perfectly when connected to other 3rd-parties:
- Pico-W as AP can receive a lot of small UDP packets/second from a Python script without issues.
- Also Pico-W as a sender can send a lot of small UDP packets to a Python AP.
- But when mutually connected they do not like each other.

peterharperuk commented 6 months ago

I've closed this because you raised it against the pico-sdk

marcos-diaz commented 6 months ago

👍