After changing base UUID of Nordic UART service it stops working

[Deepak Kumar]

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.

{{0x00, 0xC7, 0xC4, 0x4E, 0xE3, 0x6C, 0x51, 0xA7,0x33, 0x4B, 0xE8, 0xED, 0x00, 0x00, 0xB8, 0x03}}

It stops working.it connects to the uart application. in advertisement it shows with different uuid. the uuid i am using is apple midi specification.

after connecting a message popups that "doesn't support uart" and closes.

What am I missing?

[run_ar]

The Central will look for a specific UUID, so you have to update the UUID here as well. i.e. you have to update both central and peripheral so they use the same UUID.

[run_ar]

Yes, you need to change it on the central as well.

[Waqar Ahmed]

i am using nrf52 as a central  and STEVAL-STLCS01V1(

)as a peripheral .peripheral advertise 5 different services UUID .one of them is 00001801-0000-1000-00805f9b345b the same uuid i have enter as nus base uuid in central side.but i failed to connect

[run_ar]

Could you capture a sniffer trace so I can see what is happening on air? Remember that when you scan for a device you will get an advertisement report. In the adv report event you need to parse the advertisement data and check the UUID. once the UUID is identified you can connect to the device.

[Waqar Ahmed]

no it is not possible for me too capture on air packet.yes i had check the ad report.in advt report mac address of my peripheral is shown .i am running ble_uart central example from sdk 15.in this example ble_advdata.c line 779 dataoffset variable become zero.this the issue.i have only change the nus base uuid with by one the service uuid which is advertised by peripheral(00000000-0000f-11e1-9ab4-0002a5d5c51b)

[run_ar]

For reference:

https://devzone.nordicsemi.com/f/nordic-q-a/41014/unable-to-connect-nrf52832-dk-as-central-to-peripheral-device-sensortile