RE: ble mesh 5.0 couldn't send 255 bytes of data from client to server

Hung Bui — Fri, 04 Jun 2021 10:08:32 GMT

Hi Helen,

The trs_seg_packet_in() will call upper_transport_packet_in() when all the segments of the message has been received.
The Bluetooth Mesh protocol is not really designed for sending large amount of data at once. When the payload is above 11bytes it will be split into segments. Transmitting segment would require ACK on the transport layer. And it would cause more traffic to the network (if the ACK message is missing, the whole segments would need to be re-transferred)

However you should be able to send above 50 bytes. I would suggest to try debugging by using some log inside trs_seg_packet_in() to check what you receive. Please print the log on the sender side as well.

2. Please make sure you don't call generic_onoff_client_set_unack() multiple times before the packet is received on the server side. You can have only one segmented message transmitting at a time.

3. Could you check if you receive any ACK on the client ? If you set the publication address to the unicast address of the server do you see the same issue ? It's not recommended to use reliable message to the ALL node address.