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Sailoog,
The device I have "ready" is based on a PIC microprocessor. I can write NMEA data coming out of the uP but not signal K data.
If you are interested, we could provide XDR data (I do that for our weather stations as well).
Cheers
Henk
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You could work with NMEA protocol. But XDR isn't normed. SignalK standard doesn't like XDR! (There are many XDR Github forks in SignalK)
The easiest way to connect short mcu (Arduino, PIC, Teensy, STM32) will be to use Firmata as protocol.
The translation to SignalK will be done by an OP tool.
At the moment ESP8266 has the chance to directly send (wifi UDP) delta SignalK sentences to the SignalK server.
If you are able to produce a NMEA string you are also able to produce a SignalK string. I think the biggest problem will be the timestamp.
If Firmata does work stable with OP it will be the first choice.
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Let me look into the Firmata data.Something new to me. Never heard of it....