Mr-Mime

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• Max. size of data over BLE connection

  @Mr-Mime started

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  @fanoush replied
• Max. size of data over BLE connection

  in Interfacing • 2 years, 3 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.