@Gijs Thought of about the same thing. I would just add a short sleep at the end of the loop, so that in case it fails very quickly it doesn't go into a tight loop, especially if the code in the thread is sending anything (over the network or to a device connected via I2C or SPI etc.). Of course it relies on the contents of the function being able to restart a second time. I'm not sure this is 100% fool proof as I believe there are cases when some conditions will not result in proper exceptions being thrown, so of course using and feeding WDT (or an external watchdog) may be a good idea as well.

@robert-hh But it's funny that mainly the Fritzbox has the problem. Something must be different.

sadly it's the same... rst:0x7 (TG0WDT_SYS_RESET),boot:0x37 (SPI_FAST_FLASH_BOOT) configsip: 0, SPIWP:0xee clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 mode:DIO, clock div:1 load:0x3fff8020,len:8 load:0x3fff8028,len:2140 ho 0 tail 12 room 4 load:0x4009fa00,len:19760 entry 0x400a05bc

@misterlisty I did not fully analyze Pycom's implementation of the Watchdog, As far as I understand, the event they trigger is an interrupt, not reset. Which means, that in a full this interrupt fails too. Using the RTC it is possible to set up an WDT which pulls reset on expiry, but that one seems not to be used.

Could you simply feed the WDT while you write until you flush?

@timh I've already implemented internal watchdog but it doesn't help in case of Guru Meditation Error. @Martinnn You and I have the same problem. Thank you for suggestion, as I can see this watchdog times is not in a form of a development board like this one: https://shop.switchdoc.com/products/switchdoc-labs-dual-watchdog-timer-board-for-arduino-raspberry-pi?variant=3340467699742. Am I right? Thank in advance.

Hi @Andrea-Filippini, This is almost ready to be deployed, Daniel has some final tweaks he wants to make before we push this up to the firmware. Slightly confusingly, we already have the documentation live for this but are just waiting to push it to the firmware. Thanks for your patience! Alex

@pchirouze no, it should be: https://docs.pycom.io/pycom_esp32/library/machine.WDT.html