The user driving data PDU’s that consists of:
Type 3 GPS positional data at 1Hz
Type 3 Crash data at 100Hz
Other Type 1 messages (such as heartbeats Journey Starts / ends etc.)
The devices data output is optimised
The PDU payloads are very lean and efficient with no wasted space.
The Type 3 messages are filled up with 1Hz data unit and when it reaches 500Bytes, that PDU is sent to the Cloud, so a Type 3 message can contain many 1Hz samples, this is to reduce the message and packet overhead.