Why the wind instuments output MWV and not VMR

[sebba]

I played a little bit with node-red and finally I've got some expected output...
I managed to make node-red to "read" environment.wind.speedApparent and environment.wind.speedApparent and send as MWV sentence. 
It is made for MWV but will be very easy to change it to VWR, as you need. Just edit the MWV function

The node-red code, bellow. Just copy and paste it into node-red clipboard.

Code:

[{"id":"e4d4603d.6a578","type":"signalk-subscribe","z":"ee22123e.a5ff8","name":"windApparent","mode":"sendAll","flatten":true,"context":"vessels.self","path":"environment.wind.*Apparent","source":"","period":1000,"x":110,"y":40,"wires":[["e4f6bc29.01868"]],"outputLabels":["angle"]},{"id":"e4f6bc29.01868","type":"function","z":"ee22123e.a5ff8","name":"MWV","func":"var S = context.get(\"S\") || 0; //get from context or default to 0\nvar A = context.get(\"A\") || 0; //get from context or default to 0\n\nswitch (msg.topic){\n    case \"environment.wind.speedApparent\":\n        S = msg.payload; //payload NOT paydoad  :)\n        context.set(\"S\", S); //store in context for next time \n        break;\n    case \"environment.wind.angleApparent\":\n        A = msg.payload; //payload NOT paydoad  :)\n        context.set(\"A\", A); //store in context for next time \n        break;\n}\n\nmsg.temp = \"WIMWV,\" + A.toFixed(2) + \",R,\" + S.toFixed(2) + \",N,A\";\n\nvar nmea = msg.temp;\nvar checksum = 0; \n\nfor(var i = 0; i < nmea.length; i++) { \n  checksum = checksum ^ nmea.charCodeAt(i); \n}\nchecksum = checksum.toString(16);    //convert to hex\nnmea = '$' + nmea + '*' + checksum;  //make the full nmea sentence again\n\nmessage =  nmea + '\\r\\n';\n\nmsg.topic = \"WIMWV\";\nmsg.payload  = message;\nreturn msg;\n\n","outputs":1,"noerr":0,"x":290,"y":40,"wires":[["f6e4875e.141ea8"]]},{"id":"cbb96f97.6bade","type":"debug","z":"ee22123e.a5ff8","name":"","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","x":450,"y":100,"wires":[]},{"id":"1fa02e62.c03462","type":"signalk-send-nmea0183","z":"ee22123e.a5ff8","name":"","nmea0183Event":"nmea0183out","x":490,"y":140,"wires":[]},{"id":"f6e4875e.141ea8","type":"delay","z":"ee22123e.a5ff8","name":"","pauseType":"rate","timeout":"5","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":true,"x":270,"y":140,"wires":[["1fa02e62.c03462","cbb96f97.6bade"]]}]

I also have to thanks to PaddyB for his help guiding me in the right direction.
Any comments and critics are welcome, this is my first node-red code and any hints will be appreciate it.

Fair winds,
Seb