Struct calamp_rs::message_header::SequenceNumber[][src]

pub struct SequenceNumber(_);
Expand description

Sequence Number

A 16-bit number used to uniquely identify a message. This number shall be initialized to 1 by the LMU on a cold boot and will be incremented in the LMU each time an inbound message is originated by the LMU. The LMU remembers its current Sequence Number during sleep. Eventually the Sequence Number will rollover from 65535 to 1, skipping zero.

The Sequence Number is also used to identify acknowledgements and retransmissions. Responses to Acknowledged Requests shall contain the Sequence Number from the associated Acknowledged Request. A Server receiving from an LMU can also use the Sequence Number as a means to identify whether the received message is an original or a retransmitted copy, thus avoiding processing any duplicate reports from an LMU.

A Server can set the Sequence Number field to zero for all outbound messages sent to the LMU if it is not important that the LMU distinguish an original message from a retransmitted copy. However, if this distinction is necessary, the server can insert a changing non-zero value into the Sequence Number field of each new message sent to the LMU. The LMU will remember the last sequence number it received and will compare it to the non-zero sequence number for the new message. If different, it will process the message normally. If the same, it will not process the message and will return a NAK response with the ‘ACK’ field set to 7.

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