Multi-Central question

RE: Multi-Central question

Simon — Wed, 12 Jun 2019 21:08:26 GMT

In order for the peripheral to send data to a central (computer or a phone), the central has to subscribe to notifications for a characteristic.

On the central side, the device has subscribe to notifications for a characteristics by writing 1 to the corresponding CCCD (E.g. the computer subscribes to the characteristics in the HID service)

On the peripheral side, you are then able to send data to the correct device by checking the CCCD value.

Best regards,

Simon

RE: Multi-Central question

bscdb — Tue, 11 Jun 2019 13:39:33 GMT

Ohh. How does the central enable the service?

RE: Multi-Central question

awneil — Tue, 11 Jun 2019 10:05:49 GMT

The Central would only enable the Service it requires ...

RE: Multi-Central question

bscdb — Mon, 10 Jun 2019 22:25:51 GMT

I was thinking more from battery point of view. Instead of sending data over both the services, the ble device can just send data over either one. But if thats not possible then I guess I'll just use both the services.

RE: Multi-Central question

awneil — Mon, 10 Jun 2019 18:29:34 GMT

Yes, it is possible for a firmware image to have multiple Services.

[quote userid="73596" url="~/f/nordic-q-a/48408/multi-central-question"]Also how can the BLE device (in peripheral role) know whether the central is a Desktop or a phone?[/quote]

Probably easiest for the Central to just use the Service it wants ... ?