> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/b3-sms-device-installation-manual/troubleshooting/sms-server.md).

# SMS server

You may check the status of B3 SMS devices on the B3 license server.

1. Log in to B3 License server.

<figure><img src="/files/cmA1sLisu6ibj7ol6L1C" alt=""><figcaption></figcaption></figure>

2. Click SMS Devices.

<figure><img src="/files/QaWHvV4V8XQnklB0TvJQ" alt=""><figcaption></figcaption></figure>

All the B3 SMS devices that ever requested data from the SMS server are shown on this page.

3. The SMS device form present information about the device like:
   1. Last seen time stamp and the device name assigned in the device details form. The cloud colour represents the device status where green is active and gray is non active.
   2. RSSI which indicates the GSM radio signal level detected by the router.&#x20;
   3. SMS sent which gives a total of SMS'es sent by the device.
   4. Carrier (SIM card GSM operator).
   5. Created that is the date when the first request was received from teh device.
   6. IMEI that is the router HW GSM ID, independent of the SIM card.
   7. CustomerID that is the [APIUniqueID](/b3-sms-device-installation-manual/installation-procedures/router-setup/script-preparation/apiuniqueid.md) defined in the device script.

<figure><img src="/files/JAKTOciU7RGyK6ij5p3B" alt=""><figcaption></figcaption></figure>

General guidelines for RSSI are as follows (a value closer to zero indicates a stronger signal):

* **> -65 dBm:** Excellent signal strength for maximum speeds.&#x20;
* **-65 to -75 dBm:** Good signal strength, good for most internet applications.&#x20;
* **-75 to -85 dBm:** Moderate signal that may be satisfactory, but loss of stability and speed is possible.&#x20;
* **-85 to -95 dBm:** Weak signal that significantly affects call performance.&#x20;
* **Below -100 dBm:** No signal or practically unusable signal

For B3 SMS device the RSSI shall not be lower than -85 dBm.

4. Click the pen icon to open the SMS device details.

<figure><img src="/files/egCeraTajfzeJobx14XG" alt=""><figcaption></figcaption></figure>

The device name can be entered by the user.&#x20;


---

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