mqtt temperature and humidity

[redkooga]

hi
i have been trying to send temperature and humidity from node-red but get stuck with sending with semicolon between them, how is it done?

msg={
payload:
{
"dtype" : "Temp ; Humidity",
"idx": 8,
"nvalue": 0,
"svalue": hum ; temp

}}
return msg;

Thanks

[FireWizard]

HI,

See: https://piandmore.wordpress.com/2019/02 ... -domoticz/

Temperature+Humidity

The temperature+humidity sensor will show humidity and an environment level. For the temperature you can send digits after the decimal. For humidity anything after the decimal will be chopped off.

{"command":"udevice", "idx":1234, "svalue":"tm;hu;lv"}

where tm is the temperature, hu is the humidity and lv is the environment level which can have the following values:

0, normal
1, comfortable
2, dry
3, wet

So in your case you have to send from Node Red.

Code: Select all

msg.payload = {"command":"udevice","idx":8,"nvalue":0,"svalue":"temp;hum;level"};
return msg;

Regards

[redkooga]

hi thanks, i tried that it it doesn't send the values the log only shows the string in quotes.

[FireWizard]

Hi,

@redkooga

Can you publish your flow?

Regards

[redkooga]

i have been trying to get this to work for hours, i can send each value separately.

var hum=msg.payload.humidity;
var temp=msg.payload.air_temp;
var hum=JSON.stringify(hum);
var temp=JSON.stringify(temp);

msg.payload = {
"idx":8,
"nvalue":0,
"svalue":hum, temp
};
return msg;

the log entry from domoticz

2020-04-28 16:05:40.805 MQTT: Topic: domoticz/in, Message: {"idx":8,"nvalue":0,"svalue":"0","temp":"0"}
2020-04-28 16:05:40.833 Status: Warning: Expecting svalue with at least 2 elements separated by semicolon, 1 elements received ("0"), notification not sent (Hardware: 3 - rfm12, ID: 82008, Unit: 1, Type: 52 - Temp + Humidity, SubType: 1 - THGN122/123/132, THGR122/228/238/268)

[FireWizard]

Hi,

@redkooga

I will have a look to it and will try to create an example.

However it would be much easier for both of us, if you publish the flow,

Do as follows:

1. Go to Node Red and go to your tab with that flow
2. Go to the "Hamburger" menu at the top right.
3. Select "Export" and then "current flow"
4. Select "Copy to clipboard"
5. Return to this forum and in your post, select the button, marked </> and paste the contents of the clipboard (Ctrl-V)

This is much easier.

Regards

[EddyG]

This my function.

Code: Select all

var HUM=msg.payload.humidity;
var HUM_STAT=0;
if (HUM < 30) {
    HUM_STAT=2;
} else if ((HUM >= 30) & (HUM < 45)) {
    HUM_STAT=0;
} else if ((HUM >= 45) & (HUM < 70)) {
    HUM_STAT=1;
} else if (HUM >= 70) {
    HUM_STAT=3;
}
msg.payload = { "command": "udevice", "idx": 552, "nvalue" : 0, "svalue": msg.payload.temperature+";"+msg.payload.humidity+";"+HUM_STAT};

return msg;

[FireWizard]

Hi,

@redkooga

As an example find below a small test flow.

Screenshot_TEMP-HUM_flow.png (12.33 KiB) Viewed 4232 times

Brief description.

Left you find an "inject" node, just to start the flow. You should replace it with your flow.
Next you will find the function node in order to prepare it for Domoticz.
As indicated in the links above the TEMP/HUM sensor requires 3 parameters, as follows:

1. Temperature (degrees centigrade, as a string value)
2. Humidity (percentage 0-100, as a string value)
3. Humidity level as follows:
0=Normal
1=Comfortable
2=Dry
3=Wet

The contents of the function node is as follows:

Code: Select all

//var TEMP = msg.payload.air_temp;
var TEMP = "20";
//var HUM= msg.payload.humidity;
var HUM = "45";
var HUM_STAT=0;
if (HUM < 30) {
    HUM_STAT=2;
} else if ((HUM >= 30) & (HUM < 45)) {
    HUM_STAT=0;
} else if ((HUM >= 45) & (HUM < 70)) {
    HUM_STAT=1;
} else if (HUM >= 70) {
    HUM_STAT=3;
}
msg.payload = {"command":"udevice","idx":397,"nvalue":0,"svalue":TEMP + ";" + HUM + ";" + HUM_STAT};
return msg;

My thanks goes also to @EddyG to sort out the values for HUM_STAT.
(There might exist some discussions how the percentages are divided and it will differ a little bit between winter and summer)

If you run this flow, you will see in the "debug" node:

Screenshot_TEMP-HUM_flow2.png (9.95 KiB) Viewed 4232 times

The "svalue" is a string consisting of three parameters, separated by a semicolon (;).
So take care that the calculated/collected values for temperature and humidity are string values.
The whole string, you should concatenate it with + sign.

I use in this example a temperature of 20 degrees and a humidity of 45%.
You should finally remove these lines and use the lines that I have commented out (//)

Replace also the IDX (397) for your IDX number.

If everything is correct you will find the next result:

Screenshot_TEMP-HUM_flow3.png (46.84 KiB) Viewed 4232 times

Below you will find the complete flow:

Code: Select all

[{"id":"71372723.d13458","type":"tab","label":"Flow 1","disabled":false,"info":""},{"id":"b1659882.c25798","type":"inject","z":"71372723.d13458","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":240,"y":220,"wires":[["1f47577c.90fc49"]]},{"id":"1f47577c.90fc49","type":"function","z":"71372723.d13458","name":"","func":"//var tm = msg.payload.air_temp;\nvar TEMP = \"20\";\n//var hu = msg.payload.humidity;\nvar HUM = \"45\";\nvar HUM_STAT=0;\nif (HUM < 30) {\n    HUM_STAT=2;\n} else if ((HUM >= 30) & (HUM < 45)) {\n    HUM_STAT=0;\n} else if ((HUM >= 45) & (HUM < 70)) {\n    HUM_STAT=1;\n} else if (HUM >= 70) {\n    HUM_STAT=3;\n}\nmsg.payload = {\"command\":\"udevice\",\"idx\":397,\"nvalue\":0,\"svalue\":TEMP + \";\" + HUM + \";\" + HUM_STAT};\nreturn msg;","outputs":1,"noerr":0,"x":410,"y":220,"wires":[["bfc7a14b.5a7998","c028db47.8757a"]]},{"id":"bfc7a14b.5a7998","type":"debug","z":"71372723.d13458","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":590,"y":260,"wires":[]},{"id":"c028db47.8757a","type":"mqtt out","z":"71372723.d13458","name":"Domoticz In","topic":"domoticz/in","qos":"2","retain":"false","broker":"f9f13036.e28b58","x":590,"y":180,"wires":[]},{"id":"f9f13036.e28b58","type":"mqtt-broker","z":"","name":"RPI1_ MQTT_Broker","broker":"192.168.10.51","port":"1883","clientid":"","usetls":false,"compatmode":true,"keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthRetain":"false","birthPayload":"","closeTopic":"","closeQos":"0","closePayload":"","willTopic":"","willQos":"0","willPayload":""}]

Best regards

[redkooga]

thank you that has solved my problem

[bjornsundberg]

I have a similar issue.

I get this (IN*) from a sensor into Node-red and want to change and send it like this (2*) to domoticz:

(*1) - I recieve this (string):
{ "Battery" : 100, "RSSI" : 6, "description" : "", "dtype" : "Temp + Humidity", "id" : "36609", "idx" : 12, "name" : "Temp02", "nvalue" : 0, "stype" : "Rubicson/IW008T/TX95", "svalue1" : "5.7", "svalue2" : "84", "svalue3" : "3", "unit" : 1}


(*2) - send like this (note the change in IDX):
{"command":"udevice","idx":4,"nvalue":0,"svalue":"5,7;84;3"}

Anyone have some thoughts on how I do this, i guess function node?

[FireWizard]

Hi, @bjornsundberg,

You wrote:

i guess function node

You are right.

Create a "Function" node with as input the MQTT input node and as output the MQTT output node.

The contents of the "Function" node should be:

Code: Select all

msg.payload = {"command":"udevice","idx":4,"nvalue":0,"svalue":msg.payload.svalue1 + ";" + msg.payload.svalue2 + ";" + msg.payload.svalue3};
return msg;

Regards

[bjornsundberg]

@FireWizard Perfect!!! Thank you very very much - worked like a charm!

[BounceMeister]

Hi, @bjornsundberg,

You wrote:

i guess function node

You are right.

Create a "Function" node with as input the MQTT input node and as output the MQTT output node.

The contents of the "Function" node should be:

Code: Select all

msg.payload = {"command":"udevice","idx":4,"nvalue":0,"svalue":msg.payload.svalue1 + ";" + msg.payload.svalue2 + ";" + msg.payload.svalue3};
return msg;

Regards

How would it work the other way around? When i have a message with a svalue like:

Code: Select all

"svalue": "32.56;34.68;0;1014.76;0"

and i want to extract the three values in node red, how would i get the first value e.g. 32.56 out of that string in node red?

[FireWizard]

Hi, @BounceMeister,

I'm currently on a short holiday. I will answer your question and will come up with a solution, as soon as I have returned, as I do not have easy access to Node Red at the moment..

However can you tell me, what the five (not three) values represent?
How do you want the values presented? In an array? Or something else?

Regards

[FireWizard]

Hi, @BounceMeister,

As my previous questions has not been answered (yet), I will inject your string with the "Inject" node.

The string is as follows:

"svalue": "32.56;34.68;0;1014.76;0"

It looks, that it is a message received from Domoticz.

We have several possibilities to solve that and the approach is dependent on what you want with the data.
A flexible way is to put it into an array.

In this case I will use the "Node Red way".

After the "Inject" node, I put a "Change" node and this node does 2 things:

-1 Remove unnecessary characters.
-2 Split the data into the various elements and write it into an array.

The flow and the result looks as follows:

Screenshot_split_string.png (19.76 KiB) Viewed 3104 times

From there you can continue with msg.payload[0], msg.payload[1] and msg.payload[3], etc.

The complete flow is as follows:

Code: Select all

[{"id":"aad7d02a.515ff","type":"inject","z":"26947ec2.64e18a","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"svalue\": \"32.56;34.68;0;1014.76;0","payloadType":"str","x":810,"y":160,"wires":[["6a207cd0.e697c4"]]},{"id":"6a207cd0.e697c4","type":"change","z":"26947ec2.64e18a","name":"","rules":[{"t":"change","p":"payload","pt":"msg","from":"svalue\": \"","fromt":"str","to":"","tot":"str"},{"t":"set","p":"payload","pt":"msg","to":"$split(payload,';')","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":1000,"y":160,"wires":[["3b60e92b.b92fee"]]},{"id":"3b60e92b.b92fee","type":"debug","z":"26947ec2.64e18a","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":1210,"y":160,"wires":[]}]

If you have more questions, do not hesitate to ask.

Regards