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- Every time data is written to the iridium module all previous untransmitted data is overwritten
- The buffer is reset only on the following conditions
- A sbd session is successfully completed
- An incoming mavlink message would result in less than SATCOM_MIN_TX_BUF_SPACE free bytes after it is written
- Any other incomming data would result in less than SATCOM_MIN_TX_BUF_SPACE free bytes after it is written to the buffer.