MQTT ESP8266 DHT11 invalid data received (SOLVED)

[HvdW]

Hi,

I found a nice description of publishing temperature and humidity to Domoticz using MQTT on The Free Physicist and later on an even nicer one from Paulus Schoutsen on Github to set up MQTT temp/hum readings.

In the script I added this line for testing purposes.

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client.publish( "domoticz/in", "{'idx' : 56, 'nvalue' : 0, 'svalue' : '22;66;3' }");

This resulted in an error code inside Domoticz

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 MQTT: Topic: domoticz/in, Message: {'idx' : 56, 'nvalue' : 0, 'svalue' : '22;66;3' }
Error: MQTT: Invalid data received! 

So I tried

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client.publish( 'domoticz/in', '{"idx" : 57, "nvalue" : 0, "svalue" : "22;66;2" }');

which is not accepted by the Arduino compiler as a correct code.

The problem is that Arduino doesn't accept single quotation marks and Domoticz doesn't accept single quotation marks.
Mixing single and double quotation marks in one line offers a solution for most compilers, but not in this case.

Can you give me an alternative on how to publish to Domoticz in a way that is accepted by both parties?

[HvdW]

Hi,
I did another step and used Escape character to force a double quote using \"
Found it on StackExchange
This was my publish line

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client.publish( "domoticz/in", "{\" idx \" : 56, \" nvalue \" : 0,  \" svalue \" : \" 22;66;3 \" }");

Here is the result in the Domoticz logs

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2019-05-01 23:20:02.086 MQTT: Topic: domoticz/in, Message: {"idx" : 57, " nvalue " : 0, " svalue " : " 22;66;3 " }
2019-05-01 23:20:02.087 Error: MQTT: Invalid data received!

Failure!
Then I changed spacing around idx, nvalue and svalue

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client.publish( "domoticz/in", "{\"idx\" : 56, \"nvalue\" : 0,  \"svalue\" : \"22;66;3\" }");

Result: SUCCESS!

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2019-05-01 23:27:29.723 MQTT: Topic: domoticz/in, Message: {"idx" : 57, "nvalue" : 0, "svalue" : "22;66;3" } 

[Doudy]

Thank you for the code
That save me