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Graphing with node red and signalK
#1
I was sitting at anchor the other day and the wind was blowing like stink outside when it occurred to me that a graph of wind speed vs time would be quite interesting.
My setup involves NMEA 0183 feeding to a pi3 running OpenPlotter and this data stream is distributed via wifi in the boat.
I took the signalK data, extracted the wind speed and fed that to a line graph of wind speed vs time. It was supposed to run for an hour. It started just fine (after a bit of trial and error, mostly error) but then after about 5 minutes or so no additional data reached the graph. I could still see wind speed data on the wifi feed but no data was shown on the graph.
I did some googling and found out that there was/is a crashing issues with signalK when too much data is received. I don't know if this is still the case but we are talking maybe one or two data points per second, nothing really high.
Questions:
Is signalK robust enough to use or is it still alpha level stuff?
Is this something that other people have seen and maybe solved?
The way I interpret the graphing output, it is run for x amount of time or x number of data points - is it possible to configure a continuously running graph that displays only the last x hours or x data points. In other words I could look at the last hour of wind speed data whenever I wanted to, the graph is continuousy updated but data older than x hours is dropped from the graph.

I am still having lots of issues wrapping my mind around all this stuff and quite frequently my data stream as far as signalK is concerned just breaks. I use the debug display a lot and for reasons unknown to me, data is not displayed in the debug window a lot of times. I have no idea what I am doing wrong because if I restart processes every once in a while the data starts flowing like I expect it to. At this time I have come to the conclusion that either I am flaky or SignalK and/or node red is flaky. It would be interesting to find out if it is me or if other people have issues like that.
To be clear, I really haven't got a clue of what I am doing yet and I know that I am not giving enough data to really figure out what is happening but rather than banging my head against the wall I figured I would post this rambling story and maybe get a hint to lead me in the right direction ....

Thanks for reading my ramblings ....

BTW, I am running the latest version of OpenPlotter (0.11.6 ??)
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Messages In This Thread
Graphing with node red and signalK - by JD1 - 2017-05-25, 01:35 AM
RE: Graphing with node red and signalK - by kste - 2017-05-25, 05:35 PM
RE: Graphing with node red and signalK - by JD1 - 2017-05-26, 11:49 PM
RE: Graphing with node red and signalK - by JD1 - 2017-05-29, 09:57 PM
RE: Graphing with node red and signalK - by JD1 - 2017-05-30, 05:53 PM
RE: Graphing with node red and signalK - by JD1 - 2017-05-30, 06:09 PM
RE: Graphing with node red and signalK - by JD1 - 2017-05-30, 07:38 PM
RE: Graphing with node red and signalK - by JD1 - 2017-05-31, 06:33 PM
RE: Graphing with node red and signalK - by JD1 - 2017-05-31, 08:30 PM
RE: Graphing with node red and signalK - by JD1 - 2017-05-31, 10:11 PM
RE: Graphing with node red and signalK - by JD1 - 2017-06-01, 04:41 PM
RE: Graphing with node red and signalK - by JD1 - 2017-06-01, 09:25 PM
RE: Graphing with node red and signalK - by JD1 - 2017-06-01, 10:56 PM
RE: Graphing with node red and signalK - by JD1 - 2017-06-02, 08:28 PM
RE: Graphing with node red and signalK - by JD1 - 2017-06-05, 07:52 PM
RE: Graphing with node red and signalK - by JD1 - 2017-06-06, 06:57 PM
RE: Graphing with node red and signalK - by JD1 - 2017-06-07, 03:30 PM
RE: Graphing with node red and signalK - by JD1 - 2017-06-10, 05:57 AM
RE: Graphing with node red and signalK - by JD1 - 2017-06-25, 06:01 PM
RE: Graphing with node red and signalK - by JD1 - 2017-06-29, 02:49 PM
RE: Graphing with node red and signalK - by JD1 - 2017-07-07, 05:55 PM
RE: Graphing with node red and signalK - by JD1 - 2017-07-07, 06:33 PM

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