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--- doc:appunti:hardware:tl-mr6400_openwrt [2023/10/31 15:18] – [Upgrade to OpenWRT 22.05.0] niccolo
+++ doc:appunti:hardware:tl-mr6400_openwrt [2025/07/02 16:54] (current) – [LTE signal strenght LEDs] niccolo
@@ Line 141: / Line 141: @@
 }
 </code>
+^ RSSI  ^ Usability      ^
+| -60   | Good           |
+| -70   | Acceptable     |
+| -90   | Barely usable  |
+The **uqmi** can be used to get several info about the current connection, e.g. the **MCC** (Mobile Country Code), **MNC** (Mobile Network Code), **TAC** (Tracking Area Code, knwon also as **LAC**, Local Area Code):
+<code>
+uqmi --device=/dev/cdc-wdm0 --get-system-info
+{
+        "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": "222",
+                "mnc": "50",
+                "tracking_area_code": 36035,
+                "enodeb_id": 344505,
+                "cell_id": 7,
+                "voice_support": false,
+                "ims_voice_support": false,
+                "cell_access_status": "all calls",
+                "registration_restriction": 0,
+                "registration_domain": 0
+        }
+}
+</code>
+:!: **NOTICE**: Some services - like [[https://www.opencellid.org/|www.opencellid.org]] - identify the cells using the **Cell ID**, which is actually the **ECI** (E-UTRAN Cell Identifier). That identifier is composed by the //enodeb_id// (20 bits) and the //cell_id// (8 bits), using the following formula:
+**ECI = enodeb_id * 256 + cell_id**
+So, in the example above, we have that the Cell ID is:
+**%%ECI = 344505 * 256 + 7 = 88193287%%**
@@ Line 222: / Line 268: @@
 #!/bin/sh
 RSSI="$1"
 if ! echo "$RSSI" | egrep -q '^[+-]?\d+$'; then
         echo "Usage: uqmi_led.sh [RSSI]"
         exit
 fi
 echo "$RSSI" > '/tmp/lte-rssi'
 LED1=$(readlink -f /sys/class/leds/white:signal1)
 LED2=$(readlink -f /sys/class/leds/white:signal2)
 LED3=$(readlink -f /sys/class/leds/white:signal3)
 if [ "$RSSI" -eq -200 ]; then
         echo none > $LED1/trigger
         echo none > $LED2/trigger
         echo none > $LED3/trigger
 elif [ "$RSSI" -le -90 ]; then
         echo default-on > $LED1/trigger
         echo none > $LED2/trigger
         echo none > $LED3/trigger
 elif [ "$RSSI" -le -60 ]; then
         echo default-on > $LED1/trigger
         echo default-on > $LED2/trigger
         echo none > $LED3/trigger
 else
         echo default-on > $LED1/trigger
         echo default-on > $LED2/trigger
         echo default-on > $LED3/trigger
 fi
 </code>
@@ Line 331: / Line 377: @@
 | etherwake                             |    8K |
 | coreutils-base64                      |       |
+===== Sending and receiving SMS =====
+Once installed the **uqmi** package, there is a daemon process **/usr/bin/uqmi_d.sh** which is responsible for sending and receiving SMS messages. The program will check every 30 seconds if there is a file into the **send** directory and eventually save received SMS messages from the modem memory to the **received** directory:
+  * **/var/sms/send/**
+  * **/var/sms/received/**
+To send a message just create a text file into the **/var/sms/send/** directory; the first line must contain the recipient phone number, the following lines are the text message. E.g.
+<file>
++393274445556
+Hello, World!
+</file>
+Received messages will be saved automatically into **/var/sms/received/**, in files named something like **sms_20240426T150933**. The content will be something like:
+<file>
+[Phone Number|CallerID]
+Tex message.
+</file>
+If you stop the running uqmi_d.sh daemon, it is possibile to retrieve received messages from **sim** or from **me** (memory). Get first the list of messages availables and then retrieve one:
+<code>
+uqmi -d /dev/cdc-wdm0 --list-messages --storage me
+uqmi -s -d /dev/cdc-wdm0 --get-message 0 --storage me
+</code>
 ===== Web References =====
@@ Line 338: / Line 412: @@
   * **[[https://openwrt.org/docs/guide-user/base-system/led_configuration|OpenWRT - LED Configuration]]**
   * **[[https://forum.openwrt.org/t/tl-mr6400-v5-lte-disconnect-after-six-hours/125468|[TL-MR6400 v5] LTE “disconnect” after six hours]]**
+  * **[[https://www.techtrained.com/the-ultimate-cheat-sheet-for-lte-identifiers/|The Ultimate Cheat Sheet for LTE Identifiers]]**
+  * **[[https://mobilepacketcore.com/what-is-tracking-area-in-lte/|What is tracking area in LTE]]**