Mr-Mime

Member since Sep 2022 • Last active Oct 2022

1 conversations
2 comments

Embedded Dev @ http://www.emonio.de

Most recent activity

Max. size of data over BLE connection

@Mr-Mime started
- 3 comments
- 486 views
@fanoush replied
Max. size of data over BLE connection

in Interfacing • 1 year, 6 months

Hello there,

I am creating an app to connect my bangle.js 2 to an energy measuring device.
The connection is done via BLE.

The problem I am facing comes with reading 'large' data.
The maximum size I get from readValue() is 130 Bytes.

Reading the same with e.g. the NRF Connect app I get all 438 Bytes.
Data <130 Bytes works fine.

Thus I am asking myself if there is any limitation on the bangle.js side.

In general I am aware of the BLE protocol but I am missing something here.

Note:
Normally the preferred MTU size of the energy measuring device is set to 517.
When I change it to 23 Bytes, the bangle.js 2 only reads 22 bytes.

If any additional information is needed, I'll provide it ASAP.
Thanks for helping.

Send Message

Actions