The heartbeat is simply the 10 byte message header with no payload. The payload length value in the header must be set to 0 (zero). See Message Format.
Client Heartbeats
Heartbeats can be sent from the clients. This is recommended because it provides a robust method to ensure the client to server connection is still alive. The format for the heartbeat is exactly the same - header only.
Related information
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ICD-001 Track Filter Command (Witness 4.0)
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ICD-001 Acknowledge Alarm Command (Witness 4.0)
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ICD-001 Request Status Command (Witness 4.0)
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ICD-001 Detection Command (Witness 4.0)
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ICD-001 Update Entity Command (Witness 4.0)
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ICD-001 System Profile Command (Witness 4.0)
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Navtech ICD-001 Protocol (Witness 3.0)
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ICD-001 External Trigger Command (Witness 4.0)
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ICD-001 Plugin (Witness 4.0)
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ICD-001 Command Reply (Witness 4.0)
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ICD-001 Camera Command (Witness 4.0)
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ICD-001 Track Command (Witness 4.0)
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ICD-001 Tracker Command (Witness 4.0)
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ICD-001 Commands (Witness 4.0)
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ICD-001 Change Log (Witness 4.0)