[system] Watchdog alerts

[siteswapjuggler]

ESP8266 WiFi stack contain a watchdog process which monitors the WiFi tasks and looks for buffer overloads and timeout.

We suspect it as a possible cause of system freeze even if it standard behaviour is to reboot the board. Anyway a certain number of question comes in mind :

• is there a callback (to prompt the watchdog triggering)
• can we have a look on the WiFi stack buffer

[siteswapjuggler]

wdtFeed and yield added in the main loop to add extra task management time and avoir watch dog timer triggering.

Answer to the previous questions :

• there is no watchdog callback
• we have no access to the WiFi stack buffer state