Hello!
I'm working on the InfiniTime project, an open source firmware for the
PineTime from Pine64. It's based on the NRF52832 MCU.
InfiniTime is running on FreeRTOS and uses NimBLE as BLE stack.
By the way : thanks everyone working on this project! Thanks to you, we
can build a 100% open source firmware for our smartwatch, which is
great! Thanks also to this mailing list that have already helped us a
couple of times!
I'm trying to analyze a strange issue we have for quite some time : BLE
connectivity works fine (we use it to synchronise the time, send heart
rate data, notify battery level, firmware update,...) for ~24h. After
roughly 24h, we lose all BLE connectivity : a host device cannot connect
to the watch, and the watch does not advertise itself when it should
(advertising is restarted every time the watch is woken up by a push on
the button). It looks like the ble stack just stops.
I've already done a few experiments:
- Run a BLE sniffer (the NRF sniffer based on the nrf52dk) next to the
watch for a day : The sniffer would see all advertising messages
whenever the watch was supposed to advertise until it saw nothing. I saw
no strange message between the last time the sniffer saw the advertise
messages and the time I noticed the watch was not advertising anymore.
- Connect the debugger once BLE does not work anymore and look at the
tasks : both LL and Host tasks were waiting for an event on their event
queue. No deadlock or infinite loop.
- Enable the monitor mode and log all HCI messages using btmon. I did
this a while ago, but as far as I remember, I couldn't see anything
wrong.
- Change the timeout of the calls to ble_npl_eventq_get() to check if
the tasks were running properly : they did. They just didn't receive any
new event3
So, as far as I can see, it looks like everything is running fine, but
no new event is generated to unlock the ble tasks. So I guess I have to
probe a bit deeper in the radio/isr code?
Any suggestion to analyze this issue is welcome. What debug info can I
add/enable to try to understand what's happening under the hood? I have
a NRF52DK board on hand with a logic analyzer if needed.
The source code is here (https://github.com/JF002/InfiniTime) and we are
using nimble 1.3 master branch commit
82153e744833821e20e9a8b0d61c38b2b0dbcfe1.
Thanks for your help!
