How to connect a Microchip LoRa modem to a Multitech mLinux conduit

[Louis Croisez]

Hello,
I am currently playing with connecting some Mdots with my LoRa Multitech gateway, and all is coherent.
I own also a Microchip LoRa modem, driven by an Arduino-like board.
In this Arduino sketch, I must enter a network key and an application key, which I don’t know.
Could you give me a way to know these keys?
I tried to do this on the Conduit:

$ lora-query --node-config xx:xx:xx:xx

which returns me following parameters:
Net Addr
Dev EUI
Class
App EUI
AppKey
Net Session Key
Data Session Key

The “AppKey” seems to be always the same, so I suppose this is the application key that I need to know. But The “Net Session Key” parameter is changing on each JOIN of the Mdot.
Where could I find the Network key that I need ?

[Jason Reiss]

It should be the AppEUI and AppKey settings from an already joined mote.
AppEUI – NetworkEUI
AppKey – NetworkKey

You can also get them from the network server process
> nc -u localhost 6677
config

These will be generated from Network Name and Passphrase on startup.
Otherwise these values could be provided in hex format if desired.

See “network” { “eui”: “”, “key”: “” }

[Louis Croisez]

I am reading chapter 6.3 from LoRaWAN standards, and I try to understand it well.
As concern my LoRa+Arduino case, I must enter two 512bit keys. I suppose that it is in fact the NwkSKey and the AppSKey, two sessions keys which are the result of the {DevEUI/AppEUI/AppKey} personalization.

This means that I have to do something on my gateway to produce a new couple of {NwkSKey/AppSKey}, that should “register”, or “activate” my new device.

I must do this by hand because the Microchip device does not share the same API like other Multitech systems.

But the question is: how can I activate my new device by hand?

[Louis Croisez]

sorry, my mistake: do not read 512bit keys, but 128bit keys instead.

[Bryan Tran]

Hi Louis,

Have you seen this link – http://www.multitech.net/developer/forums/topic/join-issue-with-microchip-lora-radio-rn2903/

Thank you,

BT

[Louis Croisez]

Hello Bryan,
thank you very much for answering me.

I just read the post you mentioned.
Just a last question:
is it absolutely required to configure network[“public”]=true, for RN2483 module to join and emit successfully?

[Bryan Tran]

Hi Louis,

You do need to set it to true.

Thank you,

BT

[Louis Croisez]

I wonder what is the actual impact of this network[“public”]=true parameter?
Does this mean that the LoRa communication is not fully encrypted?
What is changed in the LoRa communication when putting this param to true?

[Bryan Tran]

Hi Louis,

Conduit mLinux: LoRa Use With Third-Party Devices

Thanks,

BT

[Jason Reiss]

The public network setting is documented on these pages.

Conduit mLinux: LoRa Use With Third-Party Devices

Introduction to LoRa

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