UAVcast over 3G/4G doesn't work

RetoB

I don't get UAVcast-Pro working via 3G/4G. On my local WLAN it works fine.

My system:

Raspberry Pi Zero W running Rasbian Buster and UAVcast-Pro
Huawei 3372h (HiLink) connected to the RPI via USB
PixRacer connected to the RPI via Serial1 (GPIO)
Groundstation laptop with internal SIM card running Windows 10 and Mission Planner

What works:

I can connect from Mission Planner to my UAV via my WLAN:

Protocol: TCP
IP address of RPI: 192.168.0.148
Port of RPI: 14550

Unfortunately I don't manage to break the barrier of my local WLAN and get out to 3G/4G.

On the RPI ifconfig shows:

pi@raspberrypi:~ $ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.8.100 netmask 255.255.255.0 broadcast 192.168.8.255
inet6 fe80::576:1fc2:d9a0:aaf9 prefixlen 64 scopeid 0x20<link>
ether 0c:5b:8f:27:9a:64 txqueuelen 1000 (Ethernet)
RX packets 8 bytes 1370 (1.3 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 46 bytes 6158 (6.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.248 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::f18c:8f0d:4ec7:33e6 prefixlen 64 scopeid 0x20<link>
ether b8:27:eb:0d:1c:02 txqueuelen 1000 (Ethernet)
RX packets 126 bytes 11798 (11.5 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 139 bytes 20516 (20.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

pi@raspberrypi:~ $`

On the ground station laptop ipconfig shows:

C:\Users\bur>ipconfig

Drahtlos-LAN-Adapter WLAN:

Verbindungsspezifisches DNS-Suffix: home
Verbindungslokale IPv6-Adresse . : fe80::9513:33ec:3f8a:227c%32
IPv4-Adresse . . . . . . . . . . : 192.168.0.52
Subnetzmaske . . . . . . . . . . : 255.255.255.0
Standardgateway . . . . . . . . . : 192.168.0.1

Mobiler Breitbandadapter Mobilfunk:

Verbindungsspezifisches DNS-Suffix:
IPv6-Adresse. . . . . . . . . . . : ::c40c:c323:2853:58b6
Temporäre IPv6-Adresse. . . . . . : ::d0f2:f9dc:4e0c:bd19
Verbindungslokale IPv6-Adresse . : fe80::c40c:c323:2853:58b6%7
IPv4-Adresse . . . . . . . . . . : 10.69.125.80
Subnetzmaske . . . . . . . . . . : 255.255.255.0
Standardgateway . . . . . . . . . : fe80::5%7
10.69.125.1

C:\Users\bur>

Which addresses and ports do I need to configure to get the connection running on 3G/4G?

I read it would be easiest to setup a VPN, e.g. on Google Cloud Service. But that goes with costs. What is the recommended standard solution?

Sinamics

RetoB Hi and welcome.
You need to add a VPN tunnel between your GCS and RPI.
The easiest way is zerotier vpn, it takes you just a couple of minutes.

Create an account at zerotier and create a network. Paste this line into the RPI.
Change the NETWORK_ID with yours.
curl -k -s https://install.zerotier.com | sudo bash && sudo zerotier-cli join YOUR_NETWORK_ID

Download zerotier app for your laptop or phone, add the same network id there.
Then you can use the Managed IP in zerotier central to access RPI.

ALso check out this video how to configure zerotier. You will need to install it manually as described above.
https://www.youtube.com/watch?v=p3DZxDkI5M0&feature=youtu.be

RetoB

Thanks for your reply.

I got one step further:

Now I can connect from my laptop computer to the Raspberry Pi via VPN using the new IP address assigned by ZeroTier. I can establish an SSH connection, access the UAVcast webinterface and connect Mission Planner via TCP. That works both if my laptop computer is connected via Wifi or its internal SIM card to the internet. Good first step.

Unfortunately I can only establish these connections as long the Raspberry Pi is connected via Wifi. As soon the RPI is only connected via the Huawei E3372h 3G/4G I cannot connect to it anymore, neither via SSH nor UAVcast webinterface nor Mission Planner. The Huawei E3372h 3G/4G shows a cyan solid led, therefore seems to be well connected to a 3G+/LTE network.

When I reestablish wifi I see following network settings in UAVcast:

Via SSH I get following information from ifconfig:

There are several indications that there is traffic going over the Huawei E3372h 3G/4G, but apparently not the traffic needed for UAVcast, SSH and Mission Planner.

How can I get the full connection established when the RPI has only connection via the Huawei E3372h 3G/4G (no wifi)?