In second part we're using the same hardware setup as in Stratux case but going with latest Raspberry Pi distribution package: Raspbian Stretch with desktop. It has necessary components for adsb_hub and can be downloaded from official website. Once again Etcher is great to write an image and after that ssh, wpa_supplicant.conf files can be created in root folder of SD card to enable ssh access and connect to your home Wi-Fi router respectively.
After Pi started you should be able to connect to it using ssh. In order to install rtl_tcp and adsb_hub use following commands:
At this point you can start adsb_hub:
Next step is to setup Pi's own Wi-Fi network so iOS device can connect to it when Wi-Fi router is not around. Please follow instructions listed here. You don't need to have a bridge but the rest of the stuff is spot on. Just don't forget to change ssid and wpa_passphrase in /etc/hostapd/hostapd.conf and skip the step sudo service dhcpcd restart because it can make Pi inaccessible. After reboot try to join newly created Wi-Fi network from iOS device using IP 192.168.4.1 . In the future it's easy to switch Pi back to Wi-Fi router by commenting out wlan0 configuration in /etc/dhcpcd.conf plus reboot.
In order to start on boot adsb_hub need to be added to /etc/rc.local file. Run sudo vi /etc/rc.local and insert before exit 0 in the end:
# Auto run adsb_hub
sudo /home/pi/realadsb/start.sh > /dev/null
Sending logs to /dev/null is a good way to save some energy and increase lifespan of SD card. As a result with 5200mAh battery you can expect solid 4+ hours of radio spotting. Due to low voltage a red LED on Pi will not be always light up. However it's still enough to run adsb_hub on headless Pi and USB stick with its own light source such as RadarBox ADS-B FlightStick helps you to see if it's powered or not.