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technical:lte [2022/11/23 10:00]
admin created 		technical:lte [2022/11/23 14:56] (current)
admin [Using AT Commands]
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 ====== Hands On LTE on OpenWrt ====== ====== Hands On LTE on OpenWrt ======
 ===== Supported hardware ===== ===== Supported hardware =====
 +  * The supported LTE hardware in OpenWrt can be a minefield and my recommendation is to stick with those hardware that have been tested by the community to be confirmed working.
 +  * In the past I tried to use a Huawei LTE USB stick. 
 +  * They can be running in two modes.
 +        * **RNDIS**  https://openwrt.org/docs/guide-user/network/wan/wwan/ethernetoverusb_rndis
 +        * **NCM**  https://openwrt.org/docs/guide-user/network/wan/wwan/ethernetoverusb_ncm
 +  * The preferred mode is **NCM** but the with USB stick I had it was impossible to switch modes and I was stuck with **RNDIS** mode.
 +  * Another time I had a Mikrotik Access Point flashed with OpenWrt that had one of their LTE modems (pcie card). After many days of trying various things I eventually just gave up and replaced the card with one that has proper OpenWrt support.
 +  * Some Access Points that comes with LTE modems included are well supported in OpenWrt.
 +        * Cell-C / Belotech (https://openwrt.org/toh/cell_c/rtl30vw)
 +        * GL.iNet GL-MiFi (https://openwrt.org/toh/gl.inet/gl-mifi)
  
 ===== Packages to include ===== ===== Packages to include =====
 +  * To get the LTE modem working in OpenWrt you need to include some specific packages.
 +  * There are also some optional packages that you can include since they come in handy.
 +==== Required ====
 +  * kmod-usb-wdm
 +  * kmod-usb-net
 +  * kmod-usb-net-qmi-wwan
 +  * libqmi
 +  * uqmi
 +  * kmod-mii
 +<code bash>
 +opkg update
 +opkg install kmod-mii kmod-usb-net kmod-usb-wdm kmod-usb-net-qmi-wwan uqmi
 +</code>
 +For Serial Support (AT Commands)
 +  * kmod-usb-serial
 +  * kmod-usb-serial-option
 +  * kmod-usb-serial-wwan
 +<code bash>
 +opkg update
 +opkg install kmod-usb-serial-option kmod-usb-serial kmod-usb-serial-wwan
 +</code>
 +
 +==== Optional ====
 +  * qmi-utils
 +  * picocom
 +  * luci-proto-qmi
 +<code bash>
 +opkg update
 +opkg install picocom qmi-utils uci-proto-qmi
 +</code>
 +
 + 
  
 ===== Interacting with the modem ===== ===== Interacting with the modem =====
 +  * After you installed the packages reboot the Access Point.
 +  * If everything works as intended you should see the following device
 +<code bash>
 +ls -l /dev/cdc-wdm0
 +</code>
 +  * Now you can try to interact with the modem.
 +<code bash>
 +uqmi -d /dev/cdc-wdm0 --get-data-status
 +#This is the return
 +"connected"
 +
 +uqmi -d /dev/cdc-wdm0 --get-signal-info
 +#This is the return
 +{
 + "type": "lte",
 + "rssi": -69,
 + "rsrq": -11,
 + "rsrp": -96,
 + "snr": 11.000000
 +}
 +
 +uqmi -d /dev/cdc-wdm0 --get-system-info
 +#This is the return
 +{
 + "wcdma": {
 + "service_status": "none",
 + "true_service_status": "none",
 + "preferred_data_path": false
 + },
 + "lte": {
 + "service_status": "available",
 + "true_service_status": "available",
 + "preferred_data_path": false,
 + "domain": "cs-ps",
 + "service": "cs-ps",
 + "roaming_status": "off",
 + "forbidden": false,
 + "mcc": "655",
 + "mnc": "07",
 + "tracking_area_code": 18,
 + "enodeb_id": 18353,
 + "cell_id": 80,
 + "voice_support": true,
 + "ims_voice_support": false,
 + "cell_access_status": "all calls",
 + "registration_restriction": 0,
 + "registration_domain": 0
 + }
 +}
 +</code>
  
 ===== UCI Configuration ===== ===== UCI Configuration =====
 +  * The UCI system includes support for LTE confguration in ///etc/config/network//.
 +  * The MESHdesk firmware will create the config section based on the configuration returned by the controller.
 +  * Here is a sample section as reference
 +<code bash>
 +config interface 'wwan'
 + option ifname 'wwan'
 + option disabled '0'
 + option wan_bridge '0'
 + option device '/dev/cdc-wdm0'
 + option apn 'lte.broadband.is'
 + option proto 'qmi'
 + option auth 'none'
 +</code>
 +  * You can also install the **luci-proto-qmi** package which essentially does the same that MESHdesk and APdesk does but only local on the Access Point. 
  
  
 ===== Using AT Commands ===== ===== Using AT Commands =====
 +  * We can use picocom terminal to reach the LTE modem
 +<code bash>
 + picocom /dev/ttyUSB2
 +</code>
 +  * I had to first issue the following commands before the modem returned something for CUSD
 +<code bash>
 +
 +AT+CMGF=1
 +OK
 +ATZ
 +OK
 +AT+CUSD=1,"*101#",15
 +OK
 +
 ++CUSD: 0,"Balance: R 0.00 .Data: 25.83 MB.",15
  
 +</code>
 +  * You can allos issue the following command without needing to log into picocom
 +<code bash>
 + echo 'AT+CUSD=1,"*101#",15' | picocom -qrix 10000 /dev/ttyUSB2
 +#Here is what my provider returned
 ++CUSD: 0,"Balance: R 0.00 .Data: 6.40 MB.",15
 +</code>
  
  
Last modified: 2022/11/23 10:00