Transports.IridiumSBD: added preliminary driver.
Transports.IridiumSBD: made driver a thread to cope with unsolicited messages.
Transports.IridiumSBD: added support for sending SBDs.
DUNE sendmsg: added IridiumMsgTx.
Transports.IridiumSBD: updated development config with UDP and different serial port.
Transports.IridiumSBD: added getQueuedMT() and fixed isSuccessMT().
Transports.IridiumSBD: added support for receiving SBDs and ring alerts.
Transports.IridiumSBD: added logging and second modem to development configuration file.
Transports.IridiumSBD: added doxygen documentation.
Transports.IridiumSBD: added doxygen documentation.
Transports.IridiumSBD: added doxygen documentation.
Transports.IridiumSBD: re-organized code, added doxygen comments, added getRSSI() function.
Transports.IridiumSBD: added getMOMSN() and setFlowControl to driver.
Transports.IridiumSBD: added hasValidMSN(), getMSN() and setMSN() to transmit request.
Transports.IridiumSBD: cleanup, added support for periodically check mailbox.
Transports.IridiumSBD: fixed handling of source and destination addresses.
Transports.IridiumSBD: added maximum transmission rate argument.
Transports.IridiumSBD: fixed cooling period.
Transports.IridiumSBD: added maximum transmission rate.
Merge branch 'feature/iridium'