Moved the new Raspberry Pi ntp server to the shed and did the last bits of configuration / 2020-10-04

2020-10-04 Moved the new Raspberry Pi ntp server to the shed and did the last bits of configuration 3 weeks ago
I moved the new ntp server to the shed today. I found a nice case for it: an actual wooden box. I climbed on the roof of the shed to find a place for the GPS antenna (with magnetic base). Parts of the enclosures around our solar panels are from ferrous metals, so I found a place with an ok view of the sky to place the antenna and led the cable to a ventilation shaft to get it inside the shed. I made sure the cable was going up in the ventilation shaft first to avoid having a drip loop on one of our bicycles.

Although I did most work on the w1retap configuration before I couldn't get it running at first. I kept seeing the error message:
koos@henkp:~ $ LD_LIBRARY_PATH=/usr/local/lib/w1retap w1find DS2490-1
Error 119: Failed to set libusb configuration
It took some serious searching to find a hint: that is caused by the usb device file access rights. Solution is to install the 45-w1retap.rules that comes with w1retap into /etc/udev/rules.d.

At the moment weather data is being fetched on the Raspberry but the wifi between shed and house is so bad that the data stays there. I'm not sure how that can be fixed. It turns out the external wi-fi dongle I bought was listed as having 5 GHz support, but the reviews of the chipset used say it doesn't. The congestion in the 2.4 GHz band makes it very difficult to reach the pi. Doing a ping test over longer time gives me 91% packet loss.

I dug up a different 2.4 GHz antenna from the junkbox and suddenly the connection is stable with a lot less packet loss. This antenna is directional and now pointing right at my access point.

Now the weather data is collected and forwarded to the server for Weather station Utrecht Overvecht.

NTP didn't seem to work on the first try, I'm not seeing any data for the GPS_NMEA server. This works again after a powerdown/up.

With the original antenna:
1041 packets transmitted, 85 received, +879 errors, 91% packet loss, time 1062745ms                                                                 
With the directional antenna:
1000 packets transmitted, 1000 received, 0% packet loss, time 1000296ms
rtt min/avg/max/mdev = 1.651/14.527/730.338/35.702 ms

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