Changing base UUID of Nordic UART service causes it to stop working

[Primož Kralj]

I have successfully set up UART/Serial Port Emulation over BLE example. I have modified it so that it works with two nRF51 DKs, one acting as a central and other acting as a peripheral.

The base UUID for this service by default is

{0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x00, 0x00, 0x40, 0x6E}

but I would like to use my own base UUID. For starters, I tried changing just one word (4th, 0x22):

{0x9E, 0xCA, 0xDC, 0x22, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x00, 0x00, 0x40, 0x6E}

I made sure that new UUID is the same on both projects, central and peripheral. However, after this change, the DK's won't even pair anymore.

What am I missing?

[Petter Myhre]

Strange. By pair, do you mean connect or pair like in pairing?

[Primož Kralj]

I mean pair as in pairing :) I will investiagte further and post my findings. In the meantime, if someone has any idea what could be wrong, please do tell.

[Petter Myhre]

Sorry, had to check. I guess you are bonding as well then. Are you sure you have deleted the bond information on both devices?

[Primož Kralj]

Yeah, sure. And bonding is occurring too. I have erased flash and reprogrammed SoftDevice on both DKs with no luck. What I used is this as a central and ble_app_uart project example from SDK9 as peripheral. Is it possible that base UUID for this service (Nordic UART service) is programmed in SoftDevice itself?

[Petter Myhre]

Have you added the device manager to ble_app_uart? Out of the box this example doesn't support pairing (or bonding).