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  • RE: Only one alarm can be sent

    You are right. This is exactly how it is currently implemented. The NB-IoT CoT access is currently only a test product and thus the behavior of the alarm is not scheduled to change anytime soon. I will forward your request to our internal team for further discussions.

    posted in Cloud of Things
  • Only one alarm can be sent

    Hello,

    I am working on a device which connects to the CoT and I don’t understand how alarms work. I thought that I can register all 4 severities of alarms and then, when something occurs, I will send some string about what happened to the one which is appropriate.

    When I send the first alarm, everything works out fine. But when I send another one it gets counted as an occurrence of the first one. Regardless of the severity, regardless of the message. This happens until the first alarm is marked as resolved.

    Should I do something different to be able to send more then one alarm till user input?

    Thank you for any advice

    posted in Cloud of Things
  • RE: NB IoT Connector & Protocol MQTT-SN

    MQTT-SN is a protocol for data transmission (specification available here:

    http://mqtt.org/new/wp-content/uploads/2009/06/MQTT-SN_spec_v1.2.pdf)

    It works in the publish/subscribe manner. A device which wants to send data to CoT, needs to have implemented this protocol. The easiest way to implement is to use the Open Source Paho Client from von Eclipse.

    https://eclipse.org/paho/clients/c/embedded-sn/

    CoT can only be addressed over the REST interface and therefore the connector is needed to convert incoming MQTT-SN messages to CoT messages.

    There is a second important function of the connector. It interprets data, so for example temperature can be identified as such. Prerequisite for that is that MQTT-SN messages are being formatted according a predefined convention. How this is to be accomplished is described in the NBIOT-Protocol-Developerguide.

    If MQTT-SN messages are correctly formatted and compliant to the convention described in the developerguide, then data is transferred into the Cloud of Things.

    The mentioned IP address belongs to a private network, since it is the tunnel endpoint of the IPSec-tunnel from private APN of the CoT. This server is only acceible via the private APN.

    For sending UDP packets to a server residing in the Internet, you need to have SIM cards with public APN (internet.nbiot.telekom.de). Since you have ordered only SIM cards for CoT, you are only able to send data to the CoT with IP 172.25.102.151:1883

    posted in Cloud of Things
  • NB IoT Connector & Protocol MQTT-SN

    The “NB IoT Protocol Developerguide” is mentioning the “NB-IoT-Connector” and “NBIoT Protocol MQTT-SN”. As I understood, these are mandatory for sending data to the cloud. What is this Connector and why is it needed? Is it possible to send UDP packtes to our own server with a public Internet address?

    posted in Cloud of Things
  • RE: No connection with Cloud of Things

    First of all, before sending any data we need to open a socket with the command

                AT+NSOCR=DGRAM,17,1883
    

    Afterwards, IMSI and PW need to be converted into the hexstring format. This means the

    IMSI(ascii) = 012345678912345

    becomes

    IMSI(hexstring) = 303132333435363738393132333435

    and the password

    PW(ascii) = abcdefgh

    becomes

    PW(hexstring) = 6162636465666768

    putting these values into the AT+NSOST command yields:

    AT+NSOST=0,217.74.206.150,1883,29,1D04040103843031323334353637383931323334356162636465666768

    This means the hexstring version of payload has twice as many symbols

    (58) as specified in the number of bytes transferred (29).

    I hope that we this guidance everything will be fine.

    posted in Cloud of Things
  • No connection with Cloud of Things

    Hello,

    My device stays always into an inactive Status on the Cloud (Connection not monitored and push Connection are both inactive) even if a Connection with the Cloud of Things Gateway was stablished. I have followed the “Beispielsession NB-IoT Access und cloud der Dinge” and I´ve received the notification (030500) from the Gateway.

    How could I change this status on the cloud and receive any data from my device?

    posted in Cloud of Things
  • Welcome to IoT Forum! - Forum Etiquette

    Welcome to IoT Forum!

    There are a few ground rules for participation in our forum. Please respect these rules, and each other.

    1. The forum language is English. This is an international community, with members from all over the globe. To share the knowledge between all of us, we use English as primary language.
    2. For specific topics according your country like Netherlands, please use the relating section. There are appropriate specialists to support you in your question.
    3. All-important guides you can find in our IoT Documentation - that might help you at the beginning.
    4. Be creative and have fun!
      If you have a question but don’t want to place it publicly, you are more than welcome to write directly to us. Please use this e-mail address:
      iot-community@telekom.de
    posted in Announcements

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