Connect your Telraam device with wired ethernet instead of Wifi, using a USB2Ethernet Dongle like https://www.amazon.de/gp/product/B00MYT481C/
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Download Telraam dev image https://github.com/Telraam/Telraam-RPi/blob/master/telraam-dev-image
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Flash the image on the SD card
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Before putting the SD card into the Raspberry Pi, add the empty file "ssh" in the root of the SD card ("touch ssh")
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Put SD card into RPi, login with user pi and make new user with sudo rights
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Setup the Telraam following the instructions
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Now tweak the scripts telraam_monitoring.py in Telraam/Install and Telraam/Scripts by replacing the MAC address of the Wifi by the MAC address of your USB-to-Ethernet adapter. #mac_addr = uuid.getnode()
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Block the Wifi: "sudo rfkill block wifi"
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Check if your device keeps sending data packages on your Telraam dashboard
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Turn off wifi at boot; In /boot/config.txt, add dtoverlay=pi3-disable-wifi
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Possibly the operation of tweaking telraam_monitoring.py script is lost after OTA-update. The tweak could be added in the crontab, or manually after update.