Communication between master and slave devices (sdk15.0 or sdk15.2 )

[June6]

Now, I have a project that needs to do a master device to communicate with another slave device, but the slave device is done by the customer.I found that my main device wasn't communicating properly, so I changed the cccd_configure function in nus_c.c, changed the write_op parameter from BLE_GATT_OP_WRITE_REQ to BLE_GATT_OP_WRITE_CMD, and everything was fine. I would like to know what changes from the slave device will make the default Settings abnormal, this situation I have never encountered before.

Thanks all !

June6

[run_ar]

HI,

It's hard to say exactly what changed on the peripheral. But might be that the CCCD is not correctly configured. You could check with a sniffer to see if write request is supported. As far as I can remember it should be write request and not write command when writing to the CCCD, but I think it is up to the application to configure this. I.e. the Softdevice probably does not enforce this.