Enabling Data Packet length extension

RE: Enabling Data Packet length extension

Sigurd — Wed, 09 Jun 2021 21:04:30 GMT

I think I see it now, the raspberry does not support long MTU,

RE: Enabling Data Packet length extension

Fabrice_31 — Wed, 09 Jun 2021 17:03:49 GMT

So the raspberry ask to read an attribute and the response of the nrf52840 send 22 bytes.

Then, the raspberry asks for the following data.

Thus, on the nrf52840, it seems that there is something which send only 22 bytes (packet of 27 bytes). I tried to modify NRF_SDH_BLE_GAP_DATA_LENGTH but without success.

How to change that number of bytes sent?

RE: Enabling Data Packet length extension

Sigurd — Wed, 09 Jun 2021 16:51:19 GMT

[quote user="Fabricesic"]What is the message exchanged where the master asks for 22 bytes?[/quote]

It's start reading an attribute, first without offset, then it continues reading the same attribute with an offset at 22 bytes increment.

RE: Enabling Data Packet length extension

Fabrice_31 — Wed, 09 Jun 2021 14:10:15 GMT

Thanks.

The peripheral is the nRF52840. The master is a raspberry pi with a script to perform several tasks.

What is the message exchanged where the master asks for 22 bytes?

RE: Enabling Data Packet length extension

Sigurd — Wed, 09 Jun 2021 14:04:40 GMT

Hi,

Looks like the master requested the data in packets of 22 bytes.

What device is the master and the peripheral ? The master is a phone? and the peripheral is a nRF52840?