I’ve got a little temperature monitor device sitting in my backyard keeping track of temp/humidity for me, along with talking to a lightning sensor over SPI. The temp device is an SHT31x type weatherproof sensor. I use it to send MQTT locally to my house and to send MQTT to AdafruitIO for external v…

[image] peteb: My problem is that it locks up solid after running for between 1 and 5 days (roughly), This is often caused by the use of String or other dynamic memory stuff. One way to get around this is to regularly reset the device (e.g. using deep sleep between periods of action) or bett…

Thanks, I was afraid of that. I’ll post back next week if pulling out String helps.

I only use String for MQTT messaging, and do no other heap allocation in functions or globally. I took out all of the Strings completely, so we’ll see if it’s going to stay up longer now. I expect @ScruffR is correct though, it makes sense, though why it was so wildly inconsistent in how long it too…

OK, so I’ve been running now for a few weeks just great. I’ve been pushing out the auto reboot a bit and have been rock stable. Thanks for the help, not using String with MQTT seems to have fixed it.

Device lockup question

Firmware

Elco May 1, 2020, 3:03pm 4

Is heap fragmentation a thing on the photon? FreeRTOS Heap 4 should not be affected, but I don’t know which heap is in use here.

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Device lockup question

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