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Welcome back to Dev Odyssey Home Networking! In this episode, I show you how to take a Raspberry Pi, and connect it to 3G Internet! With a Raspberry Pi connected to cell networks, you can use this as a travel router, or as a backup internet connection when your internet goes out. This makes the use case for a Raspberry Pi Router even stronger. 3G speeds are not the fastest, but they do work in a few scenarios, like remote areas and low bandwidth deployments. 3G is being phased out in the US, so this won't be the best solution for those living in the US. I'm working on setting up a 4G connection to my Raspberry Pi using a Sierra Wireless modem, so stay tuned to see that it in action, along with my other Raspberry Pi, SBC, IoT and OpenWrt projects!

Links

Hardware

Raspberry Pi 4B Kit
[ Ссылка ]

Sixfab (PiHat) Raspberry Pi 4G/LTE Cellular Modem Kit
[ Ссылка ]

PiHat Mounting Kit (Geekworm)
[ Ссылка ]

Electronics screwdriver
[ Ссылка ]

Software

OpenWrt Image for Raspberry Pi 4B
[ Ссылка ]
[ Ссылка ]

Minicom Terminal Emulator
[ Ссылка ]

Informational

US 3G Phasing Out
[ Ссылка ]

Telit LE910 C4 AT Commands Documentation
[ Ссылка ]

OpenWrt 3G Documentation
[ Ссылка ]

Video Description / Outline

— OpenWrt Configuration

* Login with ssh root@OpenWrtIPAddress (usually 192 . 168 . 1 . 1)
* Run command opkg update
* Install packages with opkg install comgt kmod-usb-serial kmod-usb-serial-option kmod-usb-serial-wwan usb-modeswitch minicom luci-proto-3g
* Run command reboot to restart OpenWrt
* Login with ssh again, run command dmesg
* Look in dmesg output for 'modem' and ttyUSB# to verify serial interfaces loaded
* Look in dmesg for baud rate, usually next to 'ttyAMA0', generally its 115200
* Interact with serial interface using the following command: minicom -b 115200 -D /dev/ttyUSB3
* Check if AT commands work by typing AT and enter
* Check for Operator Selection - AT+COPS?
* Confirm SIM Registration - AT+CREG?
* Check Cell Signal Quality - AT+CSQ
* Check PDP Context - AT+CGDCONT?

— Network Configuration in LuCi

* Login to LuCI with credentials
* Go to Network tab, then Interfaces tab
* Click "Add New Interface"
* In popup name interface "WWAN"
* Choose Protocol "UTMS/GPRS/EV-DO"
* Click "Create New Interface" Button
* Leave “Bring up on boot” checked
* In Modem Device dropdown, choose “/dev/ttyUSB2”
* In Service Type dropdown, chose choose “UTMS/GPRS”
* In APN, type in "super" (or your specific APN)
* In PIN, leave as empty (unless you have a PIN for the SIM)
* PAP/CHAP username and password, leave empty
* Dial number, leave blank

* Click Firewall Settings tab, in Create / Assign firewall-zone dropdown, chose wan

* Click "Save", then "Save and Apply"

- Testing

* To test with ping, in terminal run command: ping -I 3g-WWAN

* To test speed, shut down wired wan interface by clicking "Stop" for the "WAN" Interface.
* Test network connection (speedtest.net) in browser

00:00 Intro
01:08 3G Considerations
01:41 Hardware / Software Intro
02:30 Hardware Assembly
05:36 Software Setup
07:22 AT Commands
09:59 Creating WWAN Interface
11:33 Ping Test / Speed Test
12:39 Outro

Attributions

Music | "Shine" by LiQWYD
Watch: [ Ссылка ]
License: [ Ссылка ]
Download/Stream: [ Ссылка ]

Icons made by Pixel perfect, Dinosoft Labs
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Raspberry Pi trademark of Raspberry Pi Trading

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