Laird BL651 (nRF52810) Can't connect

[Arnaud ELDIN]

Hello,

I'm use laird BL651 with nRF52810 module. I flash the chip with beacon program from zephyr samples. I use Segger Studio.

The chip is discovered by smartphone (with good name, attributes, ...) but i can't connect... My smartphone return an error: 0x85/GATT ERROR when i try to connect.

I try to debug software: connect callback is called with no error! And disconnected callback is called just after with error: 0x3E (BT_HCI_ERR_CONN_FAIL_TO_ESTAB).

Also I've been trying with BL652, same problem and use several smartphones/tablets and same error...

Thanks!

[Vidar Berg]

Hello,

The beacon sample is advertising non-connectable advertising packets by default. Have you tried any of the other Bluetooth samples to see if you can connect? 

[Arnaud ELDIN]

Thanks to reply,

I try with several projects (peripheral UART, peripheral ESP, ...). It's the same, disconnect when I connect...

[Vidar Berg]

It might be related to clock drift. Are you using the internal RC oscillator or an external crystal as the low-frequency clock source? 

[Arnaud ELDIN]

Thanks! I changed clock from external crystal to RC oscillator and it's works well ! Thanks a lot!

[Vidar Berg]

Thanks for the update. Note that the tolerance should be set to 500ppm when using the RC osc.