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User's Guide

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8 Message Resend Logic
A send fails if an ack is not received within the specified retry interval.
The interval of resend is specified through a parameter array in seconds, e.g. [15, 60, 300,
600]. In this case, a send fails if no ack received within 15 seconds on the first message
send, 60 seconds on the second and so on.
Each time a message is retried the backoff index is incremented by 1 so in example above
after sending a message and not receiving a response the next message will be 15 seconds.
When the last value of array is reached, it is repeated until a server ack is received. An
ack reverts the logic to original state.