Eddystone TLM secCount always starts with 0

RE: Eddystone TLM secCount always starts with 0

yuecelm — Thu, 22 Aug 2019 11:07:11 GMT

sorry the bug report is invalid, my beacon is going to shutdown and a wakeup from it works like a reset. So the 0 value is coming from es_tlm_init which is completely valid...

RE: Eddystone TLM secCount always starts with 0

yuecelm — Thu, 22 Aug 2019 10:59:32 GMT

sorry, you are right, give me some time to re-analyse the problem...

RE: Eddystone TLM secCount always starts with 0

tesc — Thu, 22 Aug 2019 09:31:41 GMT

Hi,

I am afraid I do not see any connection between time_counter and TLM.

Looking into nRF5 SDK v15.3.0, which is currently the newest release, I find es_tlm.c to use its own stopwatch for populating the SEC_CNT field. It is initialized in es_tlm_init(). Where is the link between the TLM frame in es_tlm.c and the time_counter value in es_security.c?

In es_tlm.c, the SEC_CNT field is called "ADV_SEC" in a code comment, which is incorrect. The es_tlm_frame_t structure correctly uses the name sec_cnt for the field. I think this should be aligned to both use the same terminology, but I do not know if that alone is enough to warrant an update.

Regards,
Terje

RE: Eddystone TLM secCount always starts with 0

yuecelm — Wed, 21 Aug 2019 12:24:06 GMT

the problem is that time_counter is also used for secCount in Eddystone TLM, and "when an EID slot is configured" is not really the same as "time since power-on or reboot"

RE: Eddystone TLM secCount always starts with 0

tesc — Wed, 21 Aug 2019 12:08:50 GMT

Hi,

I need some help to better understand what is the issue, so that I can verify and file a bug report.

From what I can tell, time_counter is correctly updated through the function es_security_update_time() whenever a beacon packet is sent (see the callback function adv_evt_handler() in nrf_ble_es.c.)

time_counter is set to APP_CONFIG_TIMING_INIT_VALUE on Eddystone module initialization, and/or when an EID slot is configured. Is this the issue, that it should have been set to a non-zero value (or not set at all) in any of those situations?

Regards,
Terje