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after they are merged to sw_tools

larus-breeze/sw_tools#8

Max Betz wrote:

• The scaling is not yet clearly defined in the NMEA protocol. Do my assumptions fit here?
  Ballast (1.00 - 1.60) <= would it make sense to simply transfer a value in KG here? What is the appropriate value range here (i.e. maximum ballast)?
• Bugs in % (0 - 30) <= In XCSOAR / Opensoar I find a setting between 0 ... 50 %. (0 == clean, 50% wet surface "double sink rate") Which value range/scaling do you recommend here?
• Crew weight is still missing I think. Would 0 ... 300kg fit?
• Switching between climb and pre-flight mode? Our front end can currently be switched manually or use the information from the sensor. Should this be coupled with XCSOAR?

The water ballast should be specified in the CAN bus protocol as a multiple of the "dry weight" so that it can be passed on from the sensor box to the XCSoar / OpenSoar via NMEA.

Max Betz wrote:
NMEA intervals and :
we should implement different intervals. Does the assignment fit:

• 1x / second: GGA, RMC data set, battery voltage (PLARB), air density (PLARD)
• 4x / second: Wind, Heading, Variometer, AHRS (PLARV, PLARW, PLARA, HCHDT)

In competitions pilots need to be able to set a "Pilot Event Marker" and record it using their IGC-logger. If the logger is a Power-FLARM, a NMEA-Sequence "$PFLAI,PILOTEVENT*..." shall to be sent to it.

If such an event is declared using a XCsoar frontend, the event shall be published (also via CAN bus) and fed to any wired FLARM device.

The Vario-Display shall also be enabled to trigger such an event.