Multiple notifications

BlueDev

Other Parts Discussed in Thread: CC2650

Hello,

I work on a BLE use case where the TI CC2650 chip runs as a GATT server. Multiple GATT clients (smartphones) are connected at the same time with the chip, it is currently possible to read characteristics from these Smartphone.

Now I would like that every smartphone registers for notification and receives a notification as soon as the corresponding characteristic value changes.

Is it possible to register for notification from multiple smartphones to the same characteristic?

Is it possible to send a notification to multiple GATT clients on a characteristic value change?

Is this possible in the TI BLE Stack v2.1?

Is this allowed by the BLE specification?

Thanks in advance for your inputs.

over 9 years ago

0 Pradeep Singh over 9 years ago

Expert 2475 points

Hey,
yes you can do this thing.
By writing into simpleProfile you can send notification from cc2650 to multiple Clients.
The thing will be notification will be same for everyone.

0 BlueDev over 9 years ago in reply to Pradeep Singh

Prodigy 105 points

thanks for your answer.

I had a look at the code of the simpleProfile.c. It is not clear to me how this thing is done.
Where is stored the notification subscriber list? In the Stack?
Where exactly in the code can I see that notifications are sent to several clients?

0 Pradeep Singh over 9 years ago in reply to BlueDev

Expert 2475 points

Notification will be sended to whomsoever is connected.
and to send data you can use simple profile like SimpleProfile_SetParameter(SIMPLEPROFILE_CHAR1, sizeof(uint8_t), &valueToCopy);
This will send the value to all the devices which are connected to central.

Bluetooth®︎

Bluetooth forum

Multiple notifications