CC2640R2F: Transfer comparatively large data stream by a SINGLE READ

Dulip Madurasinghe

Part Number: CC2640R2F
Other Parts Discussed in Thread: BLE-STACK

Hi all,

Requirement - Transfer large data stream through a single read.

Up to now - I'm using CC2640R2F LP as transmitter. Android (With BLE scanner app) and Apple iPhone (Custom app to read characteristics) as reciever. I used "simple peripheral" example in BLEstack. To transmit my own data stream I used Characteristic 5.

Problem - I was able to transmit 20byte (I want to increase this amount also. Please give me a suggestion) data stream updating there values (20 integers increment by 1 in every cycle) in "SimpleBLEPeripheral_performPeriodicTask" function. But when I'm reading from both phones apps (Android & Apple), I need to continuously press read to get the updated value. My requirement is to update the value without pressing read. Please give me a solution for that asap.

Kindest regards.

Dulip

over 8 years ago

0 RachelP over 8 years ago

TI__Genius 12815 points

Hi Dulip,

If you want to get an updated value for a characteristic, you should use a characteristic that has GATT Notifications enabled. Simple Profile Characteristic 4 can send Notifications. I would recommend reviewing the Custom Profile lab in SimpleLink Academy for more information.

In order to send more than 20 bytes at a time, follow the guidance in the Data Length Extension section of the BLE-Stack User's Guide.

0 Dulip Madurasinghe over 8 years ago in reply to RachelP

Expert 1235 points

Hi RachelP,

Thank you very much for the response. I will try this and get back to you.

Dulip

Bluetooth®︎

Bluetooth forum

CC2640R2F: Transfer comparatively large data stream by a SINGLE READ