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There are four startup scenarios that requires require synchronization between the Host and Module:

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First Time Startup Configuration First Time Startup Configuration

 Figure 1: First Time Startup Configuration Sequence

Figure (2) illustrates the sequence when the Module initializes before the Host (described in scenario (2)). In this scenario the Module starts sending Startup Sync Request periodically(every 5 seconds) to ensure that the Host receives the message even if the Host starts up slower than the Module. You can see in the figure, the Host Startup Ready command is sent after the Startup Sync Request. The Module is required to send a final Startup Sync Request after receiving the Host Startup Ready command. The Host can now start the Configuration sequence. 

Upon the Host completing synchronization (by performing all necessary configurations and updates) it will transmit the Startup Sync Complete command to the Module, at which point the Module will initiate the full application, i.e., commence network activities, etc. 

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Startup Synchronization Request Retries Startup Synchronization Request Retries

 Figure 2: Startup Synchronization Request Retries

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Startup Flowchart Startup Flowchart

 Figure 4: Host Startup Configuration Flow Chart