Accessing device_id from a ttn message

Application Development
1

My setup is as follows:

LAIRD Sentrius Gateway configured to use TTN which in turn links to NODE RED hosted by SenseTecnic (FRED)

I also have two LoraWan End devices with device ids of “devboard” and “belboard”

On the TTN Console I have an application called rg1xx_marlborough which has the two devices linked to it.

In NODE RED I have a ttn message node which is configured to listen for messages from the aforementioned app.

When I trigger messages from either end device the messages are detected on the NODERED debug console and everything appears to work correctly.

My problem is how can I determine which message comes from which end device?

I can see that both app_id and device_id appear under object - see screenshot below

Does anyone know how to access them?

2017-12-05 (2)

2

On a node red function just write:

var deviceId = msg.dev_id;

Then your deviceId variable should have the device id. This offcourse only works if the msg variable is not modified and is sourced directly from th TTN message node.

3

Thanks for that

4

Where do ttn mesage and ttn send come from pls? I can’t see the repository.