master mode can't find a device

[Mario]

Hello, 

I am trying to connect NRF52832 with another Bluetooth module using custom characteristics. I was able to connect two NRF52832 modules but I can't connect to another module.

The module that I am trying to connect have identical 12 and 13 bytes

for TX and RX characteristic and the Base UUID.

The first 4 bytes are the same for the Base uuid and for the characteristics. The nordic's examples the 12 and 13 bytes are use for identification of the characteristic.

Is there any way to pass this identification somehow?
For example to used the whole 128 bits uuid for identification

The softdevice is 2.0.1 nRF52832_xxaa_s132 board pca10040 and the example that i used is based on ble_app_multirole_lesc.

[Hung Bui]

Hi Mario, 
Could you post the UUID of the TX and RX characteristic (and the service as well) of the module you are connecting to ?

Note that by spec, the UUID of a characteristic is formed by the Base UUID and only byte 12 and 13 is customized by a 16 bit UUID. So it's not suggested to have a customized UUID that doesn't follow this rule. 

[Mario]

Base UUID  - 49535343 FE7D 4AE5 8FA9 9FAFD205E455
RX  - 49535343 6DAA 4D02 ADF6 19469ACA69FE
TX - 49535343 ACA3 481C 91EC D85E28A60318

(5343) is the 12 13 byte of the UUID 

[Mario]

Just to be clear the module is not made by nordic 

[Hung Bui]

I assume by "Base UUID" here you meant the service UUID ? 

In your case, you are having 3 base UUIDs. You would need to declare them as 3 different base UUID (in the code the byte endian is reverted):
49530000 FE7D 4AE5 8FA9 9FAFD205E455

 49530000 6DAA 4D02 ADF6 19469ACA69FE

49530000 ACA3 481C 91EC D85E28A60318

And in your code you define the Service, TX characteristic, and the RX characteristic all with the same value: 0x5343 

Then you need to add the 3 base UUIDs in using sd_ble_uuid_vs_add(), each of this will give you different uuid_type, use the specific type match with the UUID base when you call sd_ble_gatts_service_add() and sd_ble_gatts_characteristic_add(). 
This way you will have the UUID matched for each of the service and characteristics. 

[Mario]

I do not have 3 services I have one with 4 characteristics two of them are TX and RX  and also I do not have the source of the other chip I can only change the source of the nrf52832 

the screenshot is from the second chip(not nrf52832) do not know the manufacture.

[Hung Bui]

From this you would need to define 5 UUID bases the way I suggested in the last reply.