Downloaded and wrote Piaware SD card image 3.7.0.1 on a spare microSD card, and fired it up 
Serialized dongles: (CLICK HERE)
For 1090 Mhz to 00001090
For 978 Mhz to 00000978
(You can use any other serial numbers if you want)
piaware-config feeder-id xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
piaware-config uat-receiver-type sdr
piaware-config rtlsdr-device-index 00001090
piaware-config uat-sdr-device driver=rtlsdr,serial=00000978
sudo reboot
.
.
pi@piaware:~ $ sudo systemctl status dump1090-fa
● dump1090-fa.service - dump1090 ADS-B receiver (FlightAware customization)
Loaded: loaded (/lib/systemd/system/dump1090-fa.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2019-04-05 13:52:20 UTC; 30min ago
Docs: https://flightaware.com/adsb/piaware/
Main PID: 339 (dump1090-fa)
CGroup: /system.slice/dump1090-fa.service
└─339 /usr/bin/dump1090-fa --net-bo-port 30005 --fix --device-index 00001090 --gain -10 --ppm 0 --max-range 360 --net --net-heartbeat 60
Apr 05 13:52:20 piaware systemd[1]: Started dump1090 ADS-B receiver (FlightAware customization).
Apr 05 13:52:21 piaware dump1090-fa[339]: Fri Apr 5 13:52:21 2019 UTC dump1090-fa 3.7.0.1 starting up.
Apr 05 13:52:21 piaware dump1090-fa[339]: rtlsdr: using device #1: Generic RTL2832U OEM (Realtek, RTL2838UHIDIR, SN 00001090)
Apr 05 13:52:21 piaware dump1090-fa[339]: Detached kernel driver
Apr 05 13:52:22 piaware dump1090-fa[339]: Found Rafael Micro R820T tuner
Apr 05 13:52:22 piaware dump1090-fa[339]: rtlsdr: enabling tuner AGC
.
pi@piaware:~ $ sudo systemctl status dump978-fa
● dump978-fa.service - dump978 ADS-B UAT receiver
Loaded: loaded (/lib/systemd/system/dump978-fa.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2019-04-05 13:52:20 UTC; 29min ago
Docs: https://flightaware.com/adsb/piaware/
Main PID: 342 (dump978-fa)
CGroup: /system.slice/dump978-fa.service
└─342 /usr/bin/dump978-fa --sdr driver=rtlsdr --raw-port 30978 --json-port 30979
Apr 05 13:52:22 piaware dump978-fa[342]: Reattached kernel driver
Apr 05 13:52:22 piaware dump978-fa[342]: usb_claim_interface error -6
Apr 05 13:52:23 piaware dump978-fa[342]: Detached kernel driver
Apr 05 13:52:23 piaware dump978-fa[342]: Found Rafael Micro R820T tuner
Apr 05 13:52:23 piaware dump978-fa[342]: Exact sample rate is: 2083333.135571 Hz
Apr 05 13:52:23 piaware dump978-fa[342]: [R82XX] PLL not locked!
Apr 05 13:52:23 piaware dump978-fa[342]: SoapySDR: using maximum manual gain 49.6 dB
Apr 05 13:52:23 piaware dump978-fa[342]: SoapySDR: INFO: Using format CS8.
Apr 05 13:52:23 piaware dump978-fa[342]: [::]:30978: accepted a connection from [::1]:60598
Apr 05 13:52:25 piaware dump978-fa[342]: [::]:30978: accepted a connection from [::1]:60602
.
pi@piaware:~ $ sudo systemctl status piaware
● piaware.service - FlightAware ADS-B uploader
Loaded: loaded (/lib/systemd/system/piaware.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2019-04-05 13:52:20 UTC; 32min ago
Docs: https://flightaware.com/adsb/piaware/
Main PID: 348 (piaware)
CGroup: /system.slice/piaware.service
├─348 /usr/bin/piaware -p /run/piaware/piaware.pid -plainlog -statusfile /run/piaware/status.json
├─507 /usr/lib/piaware/helpers/faup1090 --net-bo-ipaddr localhost --net-bo-port 30005 --stdout --lat 43.5xx --lon -79.6xx
├─516 /usr/lib/piaware/helpers/faup978 --connect localhost:30978
└─917 /usr/lib/piaware/helpers/fa-mlat-client --input-connect localhost:30005 --input-type dump1090 --results beast,connect,localhost:301
Apr 05 14:17:56 piaware piaware[348]: 4360 msgs recv'd from dump1090-fa (1004 in last 5m); 4123 msgs sent to FlightAware
Apr 05 14:17:56 piaware piaware[348]: 0 msgs recv'd from dump978-fa (0 in last 5m); 0 msgs sent to FlightAware
Apr 05 14:22:56 piaware piaware[348]: 5427 msgs recv'd from dump1090-fa (1067 in last 5m); 5190 msgs sent to FlightAware
Apr 05 14:22:56 piaware piaware[348]: 0 msgs recv'd from dump978-fa (0 in last 5m); 0 msgs sent to FlightAware
Apr 05 14:23:47 piaware piaware[348]: mlat-client(917): Receiver status: connected
Apr 05 14:23:47 piaware piaware[348]: mlat-client(917): Server status: synchronized with 132 nearby receivers
Apr 05 14:23:47 piaware piaware[348]: mlat-client(917): Receiver: 159.0 msg/s received 54.7 msg/s processed (34%)
Apr 05 14:23:47 piaware piaware[348]: mlat-client(917): Server: 0.2 kB/s from server 0.0kB/s TCP to server 0.7kB/s UDP to server
Apr 05 14:23:47 piaware piaware[348]: mlat-client(917): Results: 71.5 positions/minute
Apr 05 14:23:47 piaware piaware[348]: mlat-client(917): Aircraft: 15 of 28 Mode S, 25 of 33 ADS-B used