[[PageOutline]] = Amit MDG100 and MGD200 Cellular Modem The Amit MGD200 is designed as a socket modem using a mini-PCIe form factor via USB 2.0 interface, perfect for use with Gateworks SBC's. This product has cellular capability with WCDMA and LTE Cat4 and also support GNSS receiver for location information. The device offers an OS-ready NIC interface (Option1 driver in Linux) and a friendly web-based GUI for parameter setting and status checking. Best of all it's PTCRB certified as an end device so no additional testing is required by ATT/Verizon! MDG200 is a Cat-4 LTE (150Mbps DL, 50Mbps UL) modem. * ***Recommended*** The MDG200 has AT&T, Verizon, PTCRB certification. It's available in mPCIe, M.2, and PCIe form factor. * Gateworks sells the MDG200 as a GW17050 ([https://shop.gateworks.com/index.php?route=product/product&product_id=241 Purchase Here]) * [http://www.amitwireless.com/productDetail.php?cate=996&product_id=1280 MDG200 Amit Manufacturer Page] - Datasheet and more [[Image(amitmodem.jpg, width=400)]] = Certification * AT&T [https://marketplace.att.com/certified-devices Visit URL Here] * Verizon [https://opendevelopment.verizonwireless.com/device-showcase?imagesUrl=%2Fshowcase%2Fapi%2Fimages%2Fget%2F&countUrl=%2Fshowcase%2Fapi%2Fcount%2Fget&count=0&searchBox=mdg200&page=0&pageSize=12&loading=false&moreToShow=true&sms=&operatingsystem=&simType=&eUICC=&voiceCapable=&wiFi=ðernetPort=&uSBPort=&wea=&securityLevel= Visit URL Here] = Hardware setup == MDG200 Installation This Modem consists of two pieces, a mPCI-e adapter board, and the modem module. To install see the following instructions: 1. Insert your nanoSIM into the nanoSIM socket on the bottom side of the modem module. 2. Attach the adapter board to the SBC with the two hex male/female standoffs as shown below. [[Image(amitbaseboard.png, width=400)]] 3. Plug the modem module into the connector on the adapter and then using the two screws secure it to the adapter board as shown below. [[Image(amitmounted.png, width=400)]] 4. Attach your antennas. Two I-PEX connectors are used for external LTE antenna and one I-PEX connector is used for an external GPS antenna. == Antennas * QTY 2 I-PEX connector for external LTE antenna * QTY 1 I-PEX connector for external GPS antenna Gateworks sells the [https://shop.gateworks.com/index.php?route=product/product&product_id=89 GW16065] cellular antenna and the [https://shop.gateworks.com/index.php?route=product/product&product_id=42 GW10036] pigtail. Note often PTCRB certification requires the use of the same exact antenna that was certified with and the GW16065 may or may not qualify. Taoglas is a top recommended antenna manufacturer. = Software Configuration The Gateworks board is incapable of displaying when used in a headless configuration. The Amit modem requires some configuration using it's webUI, in order to do this from the board port forwarding is required. = Software == Modem Manager Gateworks has put together a script that allows to easily reconfigure the MDG200 modem to be configurable with modem manager in AT mode. The only dependency for this script is that you have curl installed on your system (first command run here). The base OS for this is the Ubuntu system that we ship as the default image on our product. This script also assumes the modem is in the factory reset state. You can simply reset a MDG200 to the factory reset by depressing the button on the modem for >6 seconds while powered on, we have found we needed to wait 30 seconds or so after doing this for the factory defaults to be set correctly. The script logs into the web UI on the device, sets the password if needed (required on first login), set the mode to "modem" mode, sets the sim selection to the external sim (on the GW board), and set AT_NMEA mode then reboots the device. Download the init_mdg200.sh script [http://trac.gateworks.com/attachment/wiki/wireless/modem/AMITMDG/init_mdg200.txt here] * Note, the script needs execute permissions to run on the Gateworks platform. * Note, if the script has issues running, some users need to run a dos2unix command to ensure proper file encoding. Here are the commands run in order (assuming attached script is on the board at /root/init_mdg200.sh): {{{ apt-get install -y curl modprobe option echo 0x5c6 0x90b3 > /sys/bus/usb-serial/drivers/option1/new_id ifconfig usb0 up dhclient usb0 /root/init_mdg200.sh }}} After the command runs, the modem reboots and re-initializes into 'modem' mode (factory default was NAT mode) with the AT interface exposed that modemmanager can then latch on to. This takes 30-45 seconds to complete to the point modem manager can then communicate with it. If it doesn't appear after that time, a full system / power reset should be tried. From there, we were simply able to do the following to gain internet activity. {{{ mmcli -L (to get the modem number) mmcli -m --simple-connect="apn=hologram" ifconfig usb0 up dhclient usb0 ping 8.8.8.8 }}} The modprobe of the option module and the "echo" command will need to be done on init every boot (likely also the ifconfig usb0 up command & dhclient usb0), but the init_mdg200.sh should only need to be done once during provisioning. Every boot from there on after: {{{ modprobe option echo 0x5c6 0x90b3 > /sys/bus/usb-serial/drivers/option1/new_id ifconfig usb0 up dhclient usb0 }}} [http://trac.gateworks.com/attachment/wiki/wireless/modem/AMITMDG/MDG100%20work%20on%20Linux.pdf This] document explains how to use the AMIT modem with AT commands if you prefer to avoid the WebUI. == SSH It is possible to SSH into the MDG200 Default SSH username/password: (If it has not been changed in the webgui) admin/wirelessm2m Command list is provide [http://trac.gateworks.com/attachment/wiki/wireless/modem/AMITMDG/20220831-MDG100-200-CLI_Command_list_V3.docx here] == Amit webUI This method allows modem configuration through a WebGUI. This can be achieved through a SSH tunnel to the Gateworks SBC. First, on the Gateworks SBC, bring the interface up: {{{#!bash ifconfig usb0 up dhclient usb0 }}} Then run the following command on a laptop/desktop that is on the same network as the Gateworks SBC (that has [wiki:ubuntu#SSHServer SSH enabled]) {{{ ssh -L 8888:172.16.0.1:80 root@192.168.1.101 #where 192.168.1.101 is the IP of the Gateworks SBC }}} Then, on the laptop or desktop, open a browser and browse to http://localhost:8888 and you will see a modem login page (admin/admin) A more involved method that involves nftables: [[CollapsibleStart(NFTables)]] Install nftables: {{{#!bash apt-get update apt install nftables -y }}} Enable port forwarding: {{{#!bash systemctl enable nftables.service systemctl start nftables.service sysctl net.ipv4.ip_forward sed -i 's/#net.ipv4.ip_forward=1/net.ipv4.ip_forward=1/g' /etc/sysctl.conf }}} Verify port forwarding is now enabled: {{{#!bash sysctl -p }}} Configure nftables to pass traffic from modem webUI to Gateworks SBC port so it can be interfaced with on a desktop: {{{#!bash nft flush ruleset nft add table nat nft 'add chain nat postrouting { type nat hook postrouting priority 100 ; }' nft 'add chain nat prerouting { type nat hook prerouting priority -100; }' nft 'add rule nat prerouting iif eth0 tcp dport { 0-9000 } dnat 172.16.0.1' nft add rule nat postrouting masquerade }}} Bring the modem interface up: {{{#!bash ifconfig usb0 up dhclient usb0 }}} [[CollapsibleEnd]] === Configure the modem using the WebUI Acquire the ip address of eth0 (not the modem). Using a workstation on the same subnet, open a browser then enter the ip address of eth0 on the Gateworks SBC. Login using username "admin", password "admin". To enable AT/NEMA select administrator>manager, "at/nema", tick the enable box then save. [[Image(atnema.png, width=700)]] Set mode to NAT, setup>network>device-mode use the drop-down then select NAT then save. http://trac.gateworks.com/attachment/wiki/wireless/modem/AMITMDG100/amitbaseboard.png Configure cellular options (setup>network>cellular): * sim select - internal * apn - manual * manual apn - "hologram" (or your apn) * authentication - auto * ip type - ipv4 * ip modem - dynamic ip [[Image(cellular.png, width=700)]] Save. Verify ethernet settings: [[Image(ethernet.png, width=700)]] Save and logout. = Get a connection Back on the Gateworks SBC... Configure the driver: {{{#!bash modprobe option echo 0x5c6 0x90b3 > /sys/bus/usb-serial/drivers/option1/new_id }}} Use modem manager to establish a connection: {{{#!bash mmcli -m 0 --enable }}} This should return "successfully enabled the modem" {{{#!bash mmcli -m 0 --simple-connect="apn=hologram" }}} This should return "successfully connected the modem" If these steps are not working check that your SIM card is activated and your antennas are connected. A scan can be used to verify that your desired network is aviable {{{#!bash mmcli --modem 0 --3gpp-scan --timeout=300 }}} For example this will return: {{{ --------------------- 3GPP scan | networks: 310410 - AT&T (umts, available) | 311490 - 311 490 (lte, forbidden) | 310260 - T-Mobile (lte, available) | 313100 - FirstNet (lte, forbidden) | 310410 - AT&T (lte, current) | 311480 - Verizon (lte, available) | 310260 - T-Mobile (umts, available) }}} Configure the nameserver to use 8.8.8.8 {{{#!bash echo "nameserver 8.8.8.8" > /etc/resolv.conf }}} Make your default gateway the modem: {{{#!bash route add default gw 172.16.0.1 dev usb0 }}} Verify the connection is established: {{{ root@focal-newport:~# ping -I usb0 www.google.com PING www.google.com (216.58.201.228) from 172.16.0.6 usb0: 56(84) bytes of data. 64 bytes from par10s33-in-f4.1e100.net (216.58.201.228): icmp_seq=1 ttl=110 time=639 ms 64 bytes from par10s33-in-f4.1e100.net (216.58.201.228): icmp_seq=2 ttl=110 time=641 ms }}}