MKR1310 data from LoRaWAN to emoncms

Emoncms
,
1

I am trying to send data (DHT22) from an MKR1310 to emoncms via MQTT (Node-Red). The MQTT data seems to be going out but because of errors it’s not being accepted by emoncms.
The emoncms.log shows:

I think it’s a json format problem but am no expert here and need some help. I will attach a file of various data and will send anything else needed. I have several LoRaWAN data streams going into the emoncms server which all work as intended.
Thanks in advance
Cheers,
Bob
MKR1310_emoncms.txt (1.6 KB)

2

Sorry, the missing error that didn’t show up is:

2024-11-02 14:33:56.469|ERROR|input_controller.php|{"success": false, "message": "Request contains no data via csv, json or data tag"} for User: 1
3

In Node-RED, create a debug node so you can see what is being sent to the MQTT publish node.

What does the Payload look like?

4

Thanks, Brian, the debug info is in the file I attached to my initial message. Here it is in case it didn’t come through correctly. Sorry, I can’t seem to format correctly from my ipad.

==================================
Node-Red data plus error:

11/2/2024, 10:47:11 AMnode: 7662c054953ac5a4application/49/device/3930313052317908/rx : msg.payload : Object
object
applicationID: "49"
applicationName: "mkr1310"
deviceName: "mkr1310"
deviceProfileName: "mkr1310-device"
deviceProfileID: "4f2437ec-ed99-43e5-8931-614b53d6eb56"
devEUI: "3930313052317908"
txInfo: object
adr: true
fCnt: 2285
fPort: 1
data: "CRoQ6g=="
object: object
humidity: 4098
temperature: 2304
11/2/2024, 10:47:11 AMnode: Emoncms Push
msg : Object
object
topic: "http response"
payload: object
qos: 0
retain: false
_msgid: "7db47a2367fbab25"
urlsent: "http://192.168.1.174/input/post.json?json={"applicationID":"49","applicationName":"mkr1310","deviceName":"mkr1310","deviceProfileName":"mkr1310-device","deviceProfileID":"4f2437ec-ed99-43e5-8931-614b53d6eb56","devEUI":"3930313052317908","txInfo":{"frequency":904500000,"dr":0},"adr":true,"fCnt":2285,"fPort":1,"data":"CRoQ6g==","object":{"humidity":4098,"temperature":2304}}&node=mkr1310&apikey=xxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
rc: 200
warning: "ERROR: API Call Failed"
5

It needs to be a simple JSON with {key:value } pairs and no non-numeric values.

You might also find it easier just to send via MQTT.

Alternatively, select

image

6

I have selected the data type JSON as you suggest. My function node is probably incorrect:

input = msg.payload
var temperature = input.object.temperature
var humidity = input.object.humidity

msg2 = {payload:{"temperature":temperature, "humidity":humidity}};
return msg2;

I’m not a programmer so am lost here. Can you suggest the correct data for my function?

I’m sending this data from the LoRa gateway to emoncms.

Cheers,
Bob

7

If you are not comfortable programming, a change node might be better to extract the right bit of data (Google or CoPilot is your friend)

If I assume the incoming structure is such that your variables are created correctly,

var newmsg = {};

newmsg.payload = {};
newmsg.payload.temperature = msg.payload.object.temperature;
newmsg.payload.humidity = msg.payload.object.humidity;
return newmsg;

I’ve cobbled that from something else I do. Long time since I have needed to play with functions (everything is setup and works :slight_smile: )

Add ‘DEBUG’ nodes along the way so you see what your data looks like at each stage.

image

It appears in the right hand pane if you select ‘debug’

image

1 Like
8

Many thanks, Brian (@borpin) that worked and was what I needed. Much appreciated!
Cheers,
Bob

11/11/2024, 10:01:47 AMnode: d4b7831378633552

msg.payload : Object
object
temperature: 2050
humidity: 4609
1 Like