Convert autopilot route information to N2K

[fabdrol]

This PR updates the systemTime conversion and adds an autopilot conversion, that takes NMEA0183 route data ($ECAPB, $ECXTE, $ECRMB & $ECRMC) converted into Signal K, and passes this on in the format required to generate valid PGNs.

This is a work in progress as the work needs to be tested on an actual boat before it should be released. Also, many questions remain, related to the PGNs it generates (most data in the Navigation Data PGN is not present).

Also, since this is tightly coupled to the data sent by OpenCPN at the moment, there is no selection of true or magnetic bearing to waypoint, kind of routing (rhumbline) etc

@sbender9 you have some experience with APs as well, could you review my work so far and post your thoughts?

[sbender9]

Any reason not to merge this? Still WIP?

[fabdrol]

@sbender9 just because the build fails. Thoughts on why?

[tkurki]

I pushed a small fix to master in an effort to fix the failing test, but I think the test is failing for a reason: if some of the inputs are missing there won't be any output.

But that is sort of besides the point: this PR also needs some tests I think. @fabdrol are you going forward with this?

[fabdrol]

@tkurki yes, I shall. Was off work for a bit. I'll do an update soonish

[MrMount11]

I am very interested to see this PR fulfilled. It appears that the latest work on this was over a year ago, so I don't know if it is still active.

I am using signalk and opencpn, but can not get the opencpn route data to my N2K network. I can bypass signalk and go directly from opencpn to the N2K network which works very well, so the data that is passed in the 4 nmea0183 opencpn sentences and translated to PGN's in my Yacht Devices gateway (YDNU-02) is sufficient to operate my N2K autopilot (Raymarine EV-400).

One of your notes stated the need for testing, I would be willing to test your code on my boat. I am an engineer and have done lots of programming but do not know enough of javascript to be of any help with your coding efforts.

I would appreciate any feedback. Thanks