Hello,
We are using the nRF52832 in our product, along with nRF Connect version 2.6.0.
We have been working on obtaining Bluetooth certification, but we encountered issues with packet size and 2M PHY.
For the BT certification, we are using the DTM (Direct Test Mode) sample from the SDK. The tests work well with the Direct Test Mode tool in nRF Connect for Desktop. Both the transmitter and receiver function correctly in LE 1Mbps and LE 2Mbps modes with the nRF tool. However, during testing at the BT SIG test lab, we encountered failures with the 2Mbps configuration, even though there were no issues with 1Mbps. The transmitter and receiver failed in the lab, although transmission and reception via 2-wire UART worked without problems.
Could you advise on what might be causing this issue? Should we modify the DTM sample or use different firmware?
Additionally, regarding packet size, the Direct Test Mode tool in nRF Connect for Desktop supports a maximum packet length of 63 bytes, but according to the Bluetooth specification, the maximum packet length is 255 bytes. What steps are needed to send packets longer than 63 bytes? If we need to use the 'LE_Test_Setup' to increase the packet length (beyond 63 bytes), could you provide guidance or documentation for this?