Only first BLE service discoverable on iOS

RE: Only first BLE service discoverable on iOS

RK — Fri, 07 Aug 2015 12:45:23 GMT

I use lightblue for all primary testing, it basically just works (although the OSX one is a bit weaker).

Know nothing about Xamarin but the procedure on iOS is

discover peripherals with advertised services
connect to a peripheral you think might be useful
after connection discover all or just a subset of services
after services are discovered you can discover characteristics of that service

Then you can use the service. Sounds like windows 8 and android aggressively connect to everything and find all services instead of the iOS approach which has you determine what you want to connect to.

RE: Only first BLE service discoverable on iOS

Andreas — Fri, 07 Aug 2015 12:43:16 GMT

Yes, this is also my assumption. To clarify this, I will get in contact to our external partner. Thanks for support!

RE: Only first BLE service discoverable on iOS

Hung Bui — Fri, 07 Aug 2015 12:40:31 GMT

On the start screen, Lightblue will show the service UUID that included inside the advertising packet. In you code, I can see only GRL_DEV_SERVICE_UUID_TYPE included.

A central device would not be able to know what inside the attribute table without performing a service discovery after the connection is established.

I suspect that your application only look for the Service that it finds in the advertising packet, no service discovery was performed.

RE: Only first BLE service discoverable on iOS

Andreas — Fri, 07 Aug 2015 12:37:09 GMT

Hello HungBui,

thank you for this note. I tried the lightblue App. On the start screen (lightblue scans for connectable devices) it shows me my device with only one service. But when I connect to the device, I can also read/write the UUID`s of my second Service. So it seems that there is a problem on the application side!? Regards!

RE: Only first BLE service discoverable on iOS

Hung Bui — Fri, 07 Aug 2015 12:18:56 GMT

@BTprogrammer: You can try to test using third party universal BLE tool app, such as LightBlue to see if it can fully discover your att table.

RE: Only first BLE service discoverable on iOS

Andreas — Fri, 07 Aug 2015 11:25:37 GMT

Hello, The iOS application is developed by an external partner. Therefor they use the Xamarin environment. Do you have an example what procedure we have to use on the iOS side to get all services? Regards, BTprogrammer

RE: Only first BLE service discoverable on iOS

RK — Fri, 07 Aug 2015 10:38:27 GMT

Where's your iOS code to do service discovery after you've connected to the peripheral?