iMETOS® NB IoT
LPWAN DATA LOGGER FOR URBAN AREAS.
iMETOS® NB IoT is a new generation of the iMETOS® weather stations, that operates on the NB IoT network.
Mounting in the field is done in minutes. iMETOS® NB IoT can handle various sensors. Data is permanently measured in 5-minute interval and sent every 15 minutes to the server. All the data is synchronized with FieldClimate.
iMETOS® NBIoT weather station uses the NBIoT frequency for data transmission. The device requires the provisioned SIM card and needs to be in range of the NBIoT network.
Data transmission is made from the iMETOS® NBIoT weather station directly to the Pessl Instruments system using the UDP protocol.
The client has to set two things so the station can communicate:
- MCC and MNC of the SIM card network provider
- APN name (if used by the NBIoT network provider)
Optional settings (usually the default values are already set and work fine):
- IP address and port of the Pessl Instruments receiving server
- NBIoT network settings
Currently, we have 2 versions on stock and 1 in development:
NB-IoT is a Low Power Wide Area Network (LPWAN) technology that uses low power for communication and is therefore suited for the IoT connected devices. NB-IoT runs in the mobile network frequency space, using unused GSM channels or free space between LTE channels.
NB-IoT network can be only provided by the mobile network operators and a dedicated regional frequency is needed.
Typical range of the NB-IoT enabled IoT devices is 15 kilometers from the base station.
Useful for smart devices which sends small amount of data and can get also response from the server to the device. Useful for smart sensors, tracking and fleet management (coverage should be the same as for the GSM signal after all frequencies and licenses in each country are covered).
Each IoT device needs to have a provisioned SIM card, provided by the NB-IoT network operator. Latency can be between 1 and 10 seconds, the speed of the network is low and it is intended to transfer only smaller amounts of data (not more than 1 MB).
|Sensor||Supported on iMETOS® NBIoT I. Generation Board|
|METER Group EC-5||✓|
|METER Group 10HS||✓|
|METER Group Leaf wetness||✓|
|METER Group MPS-1||✓|
|METER Group GS1||✓|
|METER Group MPS-2||✓|
|METER Group MPS-6||✓|
|METER Group 5TE||✓|
|METER Group 5TM||✓|
|METER Group GS3||✓|
|Model/Type||Processor PIC18 with NBIoT modem|
|Sensors layout||3 fixed analogue inputs: wind speed, leaf wetness and rain gauge
5 digital inputs: automatic sensor recognition
|Housing||UV resistant polycarbonate plastic (Protection class IP65)|
|Dimensions without sensors||30 cm L x 16 cm W x 19 cm H|
|Weight without sensors||1.6 kg|
|Expected range||Wherever NB IoT network is available|
|Battery||6V charging battery with solar panel|
|Solar panel||Dimensions: 13.5 x 13.5 cm, 2 Watt solar panel|
|Measuring interval||5 minutes (by default)|
|15 min (by default)|
1. Example of a successful automatic communication
NB-IoT module power: ON Starting up... waiting... done. AT OK AT+CFUN=1 OK AT+COPS=1,2,"28602" OK AT+CEREG?+CEREG: 0,2 OK AT+CEREG?+CEREG: 0,2 OK AT+CEREG?+CEREG: 0,1 OK >> Registration time = 6 sec. >> Registered: home network AT+NSOCR="DGRAM",17,1992,00 OK AT+NSOST=0,"126.96.36.199",1992,36,"E56D000101C8008D00000024011003000101000000070001E7181E000200000600030000"0,36 OK AT+NSORF=0,1000,"188.8.131.52",1992,23,"C12C1A0020030101170811002513022C01038403040100",0 OK AT+NSOCL=0 OK AT+CFUN=0 OK NB-IoT module power: SLEEP
2. I have a SIM card. What is next?
- You need to get the MCC and MNC code of the network provider, that provided you the SIM card.
- You need to enter this MCC+MNC value in the menu (option P – Setup NBIoT module parameters) of the iMETOS® NBIoT station via TeraTerm.
- Insert the SIM card in the SIM card holder. More info available in uMetosNBIoT – SIM card installation v1.00.pdf manual.
3. Where does the station send the data?
The iMETOS® NBIoT sends the data to the IP and PORT of the receiver – server. This values are displayed in L – Print NBIoT module info menu option.
The current default values from sending the data to the Pessl Instruments FC platform need to be:
IP address: 184.108.40.206 Remote port: 1992
The iMETOS® NBIoT uses the UDP protocol for transmitting the data.
4. No data for my station is visible on the FieldClimate platform.
The easiest way to make sure, the station sends the data successfully to the PI server is with checking the communication process with TeraTerm and comparing it to the example of the successful communication.
Usual reasons for no data delivery are:
- the NBIoT network expects a different parameters (SCRAMBLING, APN, …),
- wrong MCC+MNC code,
- not functional SIM card,
- registration timeout,
- no network coverage.
NBIoT network parameters:
Each NBIoT network provider can have a different settings in order to connect the IoT device to their network. In most cases, it is the CR_0354_0338_SCRAMBLING, CR_0859_SI_AVOID and APN value.
Usually, the CR_0354_0338_SCRAMBLING needs to be set to TRUE.
To check the values, you need to enter the bridge mode in the menu (option M – NBIoT module bridge mode) and execute command at+nconfig? .
The module will return back:
+NCONFIG: "AUTOCONNECT","FALSE" +NCONFIG: "CR_0354_0338_SCRAMBLING","FALSE" +NCONFIG: "CR_0859_SI_AVOID","TRUE" +NCONFIG: "COMBINE_ATTACH","FALSE" +NCONFIG: "CELL_RESELECTION","FALSE" +NCONFIG: "ENABLE_BIP","FALSE"
To set the CR_0354_0338_SCRAMBLING to TRUE, you need to execute command at+nconfig=”CR_0354_0338_SCRAMBLING”,”TRUE” and the module will respond with OK .
The same applies for the CR_0859_SI_AVOID parameter. To set the parameter to true execute command
After this is set, execute the command at+nconfig? again and check the returned values.
NBIoT network providers sometimes require the APN set up.
To check the APN value, you need to execute command
In the bridge mode. The result should be similar to this
which indicates, there is no APN value set.
To set the APN value, you need to execute command
where the APN_name needs to be the APN name that the NBIoT network provider provides to you.
The iMETOS® LoRa is checking the status, if it is connected to the network with executing the
command. It checks the status every 2 seconds for maximum period of 80 seconds. If the device is not registered on the network in this time, it exits the communication process.
When the registration is successful, you will see similar output like this in the TeraTerm:
AT+CEREG?+CEREG: 0,1 OK >> Registration time = 6 sec. >> Registered: home network
This message is displayed when the station is in automatic communication mode. You will not see this message when you are in Bridge mode.
5. How to check the network availability?
If the device registers on the network successfully, then the network is available.
If the device does not register, you need to check with the NBIoT network operator the status of the network – if it is available in your area and what settings needs to be used (and compare them with the settings on your device – mentioned in point above).
6. What to do if I need more help?
Contact our support on firstname.lastname@example.org. We will gladly help you with whatever issue you may encounter.