Connection stability with S130

[Marius Heil]

Hello,

has anyone done some good testing on the connection quality between multiple nRF51 chipsets running on the S130 SoftDevice? (Using all four connections, 3 as Central, 1 as Peripheral) Given an environment with very low interferance and a timeout of 6 seconds with a connection interval of 100ms, can the SoftDevice stay in connection for multiple months? I am currently experiencing connection losses at a rather high frequency (about 2-3 per day) and I am wondering wether this is a bug that I introduced somewhere in my code. At times, I receive the BLE_GATTC_EVT_TIMEOUT event which basically forces me to close the connection. But I am wondering why this happens, because both sides process the BLE events quickly.

I guess that Nordic has done quite a bit of testing on connection stability, would you share these results?

Thanks, Marius

Edit: I am initializing the SoftDevice with NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, maybe that is part of the issue, I am currently investigating this.

[vich]

It is strange you receive BLE_GATTC_EVT_TIMEOUT, when using supervision timeouts of 6s, and if you do correctly implement GATTC responses on your peer. Please be aware that in S130 v1, APIs do return NRF_ERROR_BUSY, APIs need retry (future releases SD API will better mitigate this).

If you need greater support, one of our support engineers will be glad to assist you.

Cheers, Vinayak