LoRa Cloud Modem Services complement your device management solution by giving you fine grain control of your LoRaWAN® end devices. It allows to obtain modem status information such as: system status, firmware version, voltage, downlink signal quality and time since last downlink.
LoRa Cloud Modem Services protocol lets you manage common device functionality at the application layer for all LoRa-based devices, and manage geolocation for modem-based devices (like LoRa Edge LR1110 Solution). These services also provide protocols for reliable application data reception from all Semtech’s LoRaWAN-compatible devices, with efficient techniques to fight against packet loss.
In general, LoRa Cloud Modem Services do not interact directly with network servers to retrieve uplinks or schedule downlinks, so it is usually users’s responsibility to forward uplinks towards and schedule downlinks from LoRa Cloud as a part of the response.
However, when it comes to geolocation for modem-based devices, The Things Stack integration with LoRa Cloud Modem Services handles this on behalf of the user, i.e. it queries the protocol engine on LoRa Cloud in order to retrieve the response. This way, after the integration is configured and the uplink message containing scanning result is sent from the device, the user only has to monitor results in The Things Stack.
Before proceding with this guide, make sure you have completed the LoRa Cloud Setup guide.
Configure LoRa Cloud Modem Services Integration
To setup LoRa Cloud Modem Services integration, navigate to your application in The Things Stack.
On the left hand menu, select Integrations → LoRa Cloud. Click the Expand button next to the Modem Services.
Next, copy the token you previously created in LoRa Cloud Modem & Geolocation Services portal and paste it in the Token field.
Finish by clicking the Set token button.
Obtain Location Solutions
For LR1110 modem-based devices, location of the device can be estimated using Wi-Fi, assisted GNSS and autonomous GNSS scans. This section will show you how to obtain the location estimates using Wi-Fi and assisted GNSS scans.
Note:
Please keep in mind that this guide does not refer to LoRa Cloud Geolocation. In case you are looking for geolocation solutions that use RSSI and TOA metadata, or you are using LR1110-based device with transceiver firmware (instead of Modem-E firmware), you should follow the LoRa Cloud Geolocation guide.Note:
The number of (useful) satellites detected when running the autonomous GNSS scan might not be enough to calculate the position of your device, so we will not include that case in this guide. However, if you want to read more about it, follow this guide.After you obtain the location results, you can further integrate your The Things Stack application with other third-party IoT platforms to visualize them, etc.
Wi-Fi Scans
To learn how to perform Wi-Fi scans with LoRa Edge LR1110 device, follow this guide.
At this point, when your device performs a Wi-Fi scan and sends the resulting data in an uplink message, you will notice the location estimation results present in the Location solved message in The Things Stack Live data tab, as shown below.
Notice the Source: WIFI_RSSI_GEOLOCATION which indicates the type of scan your device is performing.
Warning:
Keep in mind that the Wi-Fi triangulation is performed here, so you will be able to obtain location estimates only if your device’s Wi-Fi scan resulted in 3 or more MAC addresses. If this is not the case, you will not see theLocation solved message in The Things Stack Live data view, but you will not see any errors either.
Assisted GNSS Scans
To learn how to perform GNSS assisted scans with LoRa Edge LR1110 device, follow this guide.
Note:
Keep in mind that in order to perform an assisted GNSS scan, you have to provide the approximate location coordinates to the LoRa Edge LR1110 device.Same as in the subsection above, when your device performs an assisted GNSS scan and sends the associated data in an uplink message, you will notice the location estimation results present in the Location solved message in The Things Stack Live data tab, as shown below.
Notice the Source: GPS which indicates the type of scan your device is performing.
Warning:
The device’s active GNSS antenna should be placed outdoors in order to be able to detect as much satellites as possible.
If you do not receive the Location solved message, it is possible that LoRa Cloud GNSS solver could not resolve your device’s location. To verify, check the log_messages object in the Service data messages. You might see errors such as:
Not enough received or usable satellites, totalReceived=4, usableGPS=3, usableBDS=0if there is too few detected and/or usable satellitesLocation fix dropped due to poor accuracy, caused most likely by big error in pseudo-ranges or timestampif the accuracy of the resulting location is too low
If you are facing these errors, keep repeating the scan and re-sending results periodically until GNSS solver manages to resolve your device’s location. Be aware that there is a high chance your device’s battery will drain much faster if you are frequently repeating these steps.
Send Requests from LoRa Cloud
Besides estimating the location of your device, you can also send requests from LoRa Cloud portal to mute or reset the device, trigger it for a re-join, set ADR profile or obtain information like temperature, voltage, signal strength, status, etc. In this section, we demonstrate how to send a request to obtain information from your device.
To send a request, navigate to Manage devices on the left hand menu in the LoRa Cloud Modem Services portal.
Click on the Send requests button.
Enter your device’s EUI in the EUI(S) field and choose Get Info as a Request type. Tick the boxes next to the information you want to obtain from your device.
Schedule the request to be sent by clicking the Send requests button.
After a few moments, click on a reload button to refresh the device information in the Manage devices view. You can already see that the Status is changed to Joined: Yes, as well as the time of the Last Uplink, Signal RSSI and Signal SNR.
Click the > button next to your device to see all the information that was obtained from the device.
