Python to automatically send a downlink to a v3 device using the HTTP webhook

End Devices (Nodes)
1

Hi Guys,

I am currently working on a web interface where the user can program custom sending intervals and transmit them via downlink to a v3 device.

For this project, I am using a LDDS75 distance sensor from Dragino:

Here is a sample code for the payload:

Downlink Command: 0x01

Format: Command Code (0x01) followed by 3 bytes time value.

If the downlink payload=0100003C, it means set the END Node’s Transmit Interval to 0x00003C=60(S), while type code is 01.

Example 1: Downlink Payload: 0100001E // Set Transmit Interval (TDC) = 30 seconds
Example 2: Downlink Payload: 0100003C // Set Transmit Interval (TDC) = 60 seconds

I have found following ressources
- outdated python sdk for ttn

I think this is the most recent and relevant resource on the subject downlink programming with http, mqtt etc.

And this documentation provides the http example that I think fits my needs best.

Is there a python example for sending the post request?

2

Not yet, because I don’t do downlinks, but if (OK, when) I do, it will appear here:

You can see how to send requests for data in the Data Storage example - downlinks are the same, just a different incantation - the computer doesn’t know you are sending a downlink rather than requesting data so don’t worry about the direction.

3

@descartes thank you for the friendly help as always. I’ll just try to implement it. There shouldn’t be too many hurdles with the provided documentation.

1 Like
4

@descartes I’m progressing a bit with my application that schedules a downlink using python. Right now, i can schedule a downlink with following payload:
“frm_payload”:“vu8=”

As provided in the documentation.

And I also see the data arriving:
image

But what kind of format is vu8=?

I would like to transmit the payload 0x00003C as provided here on page 27: https://www.dragino.com/downloads/downloads/LoRa_End_Node/LDDS75/LoRaWAN_LDDS75_User%20Manual_v1.4.pdf to change the sending interval.

5

That’s isn’t progress that is regression for all! As just posted in the other thread

“When thinking of downlinks and especially automating the process have in mind the TTN FUP … limit is 10 per day… and as Nick of these parts says whenever a downlink happens a puppy goes hungry. Downlinks render the gw deaf to uplinks…your convenience is a nightmare for all other community users in range of said gw!

One every 6 mins? :scream: :scream_cat: :bomb:

6

Don’t worry, I’m prototyping this in my office plus I’m also just sending uplinks/downlinks to gateways that we brought out in the field.

7

Sorry but no! Response here