U-blox Sara N211 (NB-Iot) to Cayenne

Cayenne API's Bring Your Own Thing (MQTT)
1

Hello,

I’m trying to use the NB-IoT chip from u-blox with the Cayenne Library. Is there someone who did something like that? The chip supports UDP messaging, but not TCP. Is this possible?

Thanks in advance,

Michael

2

Sorry, I don’t think it will work. I believe all the connection methods use TCP, is that right @rsiegel @bestes?

3

Oke, thanks for you answer. MQTT-SN is not an option then. Are there somewhere examples how the payload string is build up?

4

Sure, the docs page is over here Cayenne Docs

5

Thanks for tagging me @adam . Now my turn to tag someone :blush:

@croczey @eptak First post I’ve seen for NB-IoT. Are you able to help at all?

~Benny

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6

Hi @MichaelW

Currently the best way to use your NB-IoT enabled device is to pass the data through our MQTT broker.

The link @adam gave you is the correct documentation, however, I think what you are looking for is our payload / topic structure which can be found here: Cayenne Docs

This will show you exactly where to publish the data, and how to format the payload.

Let me know if you need any help!

-Camrin

7

Hi all,

Thanks for your replies, The documentation is really helpful. I’m working on it, if I need any help, I let you know!

Kind regards,

Michael

8

Hello @croczey ,

I already sent data to ip address: 34.225.11.151. I used the pubsub client (GitHub - knolleary/pubsubclient: A client library for the Arduino Ethernet Shield that provides support for MQTT.) and make a client class for the NB-IoT module. As far I can see now, I do not receive a message back when I sent the connect message.

Can this be because I can only send UDP messages?

Here you can see the payload for connect to socket:

AT+NSOST=0,“34.225.11.151”,1883,132,“8410800100044D51545404C2000F002430616435633566302D663231302D313165372D616265392D313732316334633133363030002463653062326538302D663230662D313165372D613266392D386637353463653936323336002863373363313237653338316635366539636636386537623237323865626631666430613966396366”
[R]: 0,132
[R]: OK

For som extra informatie page 82 of the datasheet Datasheet Sara N211

Thanks in advance,

Michael

9

Indeed, we need to add MQTT-SN support to use with NB-IoT and LTE-M .

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