BLE transmission packet length great than 20 bytes

RE: BLE transmission packet length great than 20 bytes

Mon, 10 Nov 2014 17:14:23 GMT

Thanks, guys, for the info.

RE: BLE transmission packet length great than 20 bytes

Stefan Birnir Sverrisson — Mon, 10 Nov 2014 10:47:33 GMT

Yes, if you use long write, the softdevice still only sends max 20 payload bytes per package, it is just automatically chopped up for the application.

RE: BLE transmission packet length great than 20 bytes

Jimmy Wong — Sat, 08 Nov 2014 02:48:53 GMT

Basically,the number of packets per interval is handled by stacks.

The application level keeps to try send data as much as possible.

You can refer to the case in here

devzone.nordicsemi.com/.../

RE: BLE transmission packet length great than 20 bytes

Wed, 05 Nov 2014 21:09:20 GMT

That's cool. I wonder how changing "attr_char_value.max_len" affects the settings for min and max connection interval values, number of transmission buffers used per connection interval, the size of each packet, etc.

Currently, we tweak those settings to be very specific. For example, we use 10ms connection interval, 4 transmission buffers per connection, 20-bytes packets. If we change the size of the char as you have done, does that mean the softdevice automatically chunks up the data to be sent into 20-bytes packets and sends as many packets as the number of available transmission buffers per interval?

RE: BLE transmission packet length great than 20 bytes

Jimmy Wong — Wed, 05 Nov 2014 06:48:36 GMT

You can refer to the example in the GitHub.

github.com/.../ble_app_hrs---LongWrite