RE: 8 concurrent connections fail on 51822

Bjørn Kvaale — Sat, 01 Sep 2018 09:02:40 GMT

Hi Alex,

Sorry for the delayed response. I have tested the same with 6,7 & 8 nRF51 dongles connected to a nRF51 dev kit. The dongles are running the ble_peripheral blinky example & the dev kit is running the multilink central example from sdk 12.3. When I looked at the log when 7 or 8 peripheral devices were connected, I noticed a disconnect reason 8. This is the BLE_HCI_CONNECTION_TIMEOUT shown in ble_hci.h of the multilink central example.

According to this case, it could be due to a supervision timeout. I am unsure why this works fine for 6 boards, but then does not work for 7 or 8 boards.

It could be something with the customer board's clock accuracy. Are you able to change the accuracy or PPM of the crystal? What kind of nRF51 module are you using?

You do not by any chance have 9 nrf51 dev kits to test with? My guess is everything works out of the box with 9 dev kits.

Kind Regards,

Bjørn

RE: 8 concurrent connections fail on 51822

alex kim — Wed, 29 Aug 2018 11:05:34 GMT