Ticket Created
over 4 years ago

WERETECH-8478

messages from BTLE GATT server truncated at 20 bytes

All messages from a BTLE GATT server are truncated at 20 bytes.

The server can be tested against a different client and the full payload is visible (in my case 150 bytes).

This issue is reported by other users as well (see https://forums.garmin.com/developer/connect-iq/f/q-a/196823/bluetooth-low-energy-mtu-size-for-characteristics)

As 20 bytes is the default MTU size, I guess this bug might be MTU size related.

5458292
Parents
  • over 4 years ago

    I've been recently working on application using BLE on Edge 530, and I'm seeing the same issue. Only 20 bytes of raw data is delivered in scan results.

    I took a screenshot from raw data in nRF Connect application, of advertisement package of Polar H10 sensor. Green data is visible in Edge 530, which makes exactly 20 bytes. But the red part, 0x9 Complete Local Name, is cut off.

Comment
  • over 4 years ago

    I've been recently working on application using BLE on Edge 530, and I'm seeing the same issue. Only 20 bytes of raw data is delivered in scan results.

    I took a screenshot from raw data in nRF Connect application, of advertisement package of Polar H10 sensor. Green data is visible in Edge 530, which makes exactly 20 bytes. But the red part, 0x9 Complete Local Name, is cut off.

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