Use of TimerMillis seems to interfere with LoRaWAN join

[MrSurly]

I have a TimerMillis that I'm using to blink LEDs -- it triggers every 100ms. If I do not activate this timer, the the join seems to occur immediately. When it's in use, join can take several minutes.

Having the timer > 1000 ms helps considerably.

Is there some sort of timer contention on the STM32L0?

[GrumpyOldPizza]

There should not be any conention. Mind sharing the sketch here, so that I can take a peek ?

…

On Wed, Aug 22, 2018 at 2:46 PM Eric Poulsen ***@***.***> wrote: I have a TimerMillis that I'm using to blink LEDs -- it triggers every 100ms. If I do *not* activate this timer, the the join seems to occur immediately. When it's in use, join can take several minutes. Having the timer > 1000 ms helps considerably. Is there some sort of timer contention on the STM32L0? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#33>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AG4QfJsQ3soSj88SPpeyv0xPZPcWG5wAks5uTcMRgaJpZM4WIYsd> .

[MrSurly]

It's ... very large. I'll try to make a minimum sketch that will re-create.

[GrumpyOldPizza]

Oki. What board is that on ?

…

On Wed, Aug 22, 2018, 5:10 PM Eric Poulsen ***@***.***> wrote: It's ... very large. I'll try to make a minimum sketch that will re-create. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#33 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AG4QfLVTcFuxQ5OJcSvMYWia7tNd0zb6ks5uTeT_gaJpZM4WIYsd> .

[MrSurly]

It's a custom board running the CMWX1ZZABZ-078. Variant is B-L072Z-LRWAN1. Actual MCU is STM32L082.

Note that I have not nailed it down to any root cause. I do notice that when I disable the LED timer, then it often connects immediately after the first (sometimes second) join request. Before, the wait was 5-6 join requests.

The physical gateway is 5 feet away, and we're using TTN.

[GrumpyOldPizza]

Is there a quick repro I could take a peek at ?

[MrSurly]

Yes, sorry, I've been out-of-town since Wednesday.

[MrSurly]

I'm going to close this for now. I think TTN is just slow at responding sometimes.