A submessage is an independent data structure carried inside a primary message payload. In complex network protocols, a single transmission frame often bundles multiple submessages together to reduce overhead and latency. Each submessage typically has its own header and payload, allowing the receiving system to parse and route different types of information, such as control signals and user data, from a single packet delivery.
The packet capture shows the main header is intact, but the second submessage containing the telemetry data is malformed.
When debugging dropped packets, check if the protocol parser is failing on a specific submessage type rather than rejecting the entire frame.
Related terms
Data
Digital information transmitted over a cellular network rather than a local wireless connection.
PSDU
The physical layer service data unit is the payload of data passed from the MAC sublayer down to the physical layer.
Signalling event
A discrete change in the state of a transmission channel used to convey control information or data symbols.