ot::Ip6::Tcp::HandleMessage() method

A reference to a structure containing the segment's IPv6 header.

A reference to the message containing the TCP segment.

A reference to the message info associated with @p aMessage.

Decompresses a LOWPAN_IPHC header. If the header is parsed successfully the @p aFrameData is updated to skip over the parsed header bytes.

Determines whether to send an ICMPv6 Destination Unreachable error to the sender based on reachability and source address. Specifically, if the Border Router (BR) decides to forward a unicast IPv6 message outside the AIL and the message's source address matches a BR-generated ULA OMR prefix (with low preference), and the destination is unreachable using this source address, then an ICMPv6 Destination Unreachable message is sent back to the sender.