Can I define personalized UUID to be compatible with old system?

[FrankBi]

Can I define personalized UUID to be compatible with old system? in order to be compatible with old uart transmission app.

Thanks a lot.

[Hung Bui]

Hi Frank, 

Could you give more information about your new and old system ? Which uart transmission app are you looking at ? 

[FrankBi]

Dear Hung,

Thanks for kindly reply.

In old system, customer uses BM78 module to communicate with mobile phone' app. they define an UUID as 4953443...….455(128 bit).

it could work well. while they switched bt module to our PCA10028, our SDK defined NUS_BASE_UUID as 0x9E, 0xCA,....

Thus, it could not communicate with their old mobile phone's app. could don't want to  modify app's UUID and source code.

So, need to modify our SDK the same with the UUID in mobile phone's app.  Is this possible? If any risk existing?

Thanks a lot.

Hung Bui said:

Which uart transmission app are you looking at ? 

[Hung Bui]

Hi Frank, 

The NUS example is just an example of how to define proprietary UUID. You can modify the UUID in ble_nus.c . Please modify NUS_BASE_UUID to match. 

Note that it's just the UUID, to be able to make the phone app works you would need to copy the characteristic UUID, properties, beaviour, etc. I'm not sure the service running on the BM78 module has the same functionality as in the NUS example.

[FrankBi]

Dear Hung，

Got it. I will consider it. thanks a lot.