v7.1.1884-EXPR
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Enable 2nd serial port option on M4 boards (COMM 2). Shared with PWM ports 7 (Serial Tx, J2.10 on expansion header) and 8 (Serial Rx, J1.10 on header). When using those ports for PWM (motor) outputs, be sure to disable any protocol on Serial 2 (QGC Misc. Settings/Serial Port 2/Protocol = None).
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Fix possible endless notification loop if sending of waypoints times out.
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Remove State Of Charge (SOC) parameters and functions since they're not used.
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Start up message notification queue early to allow more startup messages to come through. Increase size of notification queue to avoid loosing startup messages before comm system is active.
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Exclude unused AQ binary telemetry/command interface from default builds (define HAS_AQ_TELEMETRY to include it).