Thingspeak controlling a LED using ESP32 example

Risto Vesanto

2021 9 27

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Hi the aplication works fine but the command TURN_ON does not pass to the if-sentense. I saw some ware else solution to this poblem adding a senstence index on the POST function? Unfortunately I have lost the it an dcan not any more locate it. If there are no commands in the que it returns 0 and the lenght is 5. Below is the print outs from serial monitor

First no commands in the que

16:23:25.180 -> checking queue...

16:23:25.180 -> Latest command from queue:

16:23:25.180 -> 0

16:23:25.180 ->

16:23:25.180 -> command lenght = 5

Then with TURN_ON

16:26:16.684 -> Latest command from queue:

16:26:16.684 -> 7

16:26:16.684 -> TURN_ON

16:26:16.684 -> 0

16:26:16.684 ->

16:26:16.684 -> command lenght = 17

The else sentence else{

Serial.println(" Nothing new.");

}

also does not react to no new commands.

Any help is needed!

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Risto Vesanto 2021-9-27

At the point when it prints 5 no new commands are in the Talkback que.

the code is

// Check the result

if(x == 200){

Serial.println("checking queue...");

// check for a command returned from TalkBack

if(newCommand.length() != 0){

int z = newCommand.length();

Serial.println(" Latest command from queue: ");

Serial.println(newCommand);

Serial.print("command lenght = ");

Serial.println(z);

and so on

Risto Vesanto 2021-9-27

I did find from a older post https://community.thingspeak.com/forum/thingspeak-apps/example-talkback-code-not-working-properly-esp32/ kind of solution

"if (newCommand.indexOf("TURN_ON")>0){

Serial.println("OPEN the door");

digitalWrite(LED_BUILTIN, HIGH);

This works.

The author cstapels did have futher comments "... think the HTTP post function is the root of the error - and it didn't do this when we first wrote the code. Also it only seems to happen for ESP32, i tried on some other devices and did not get this effect.

My guess is that its in the wifi library. If you were to downgrade one version, my guess is that we would not have this problem.

The code above worked for us, we have recorded the problem and will plan to fix it in a future release. Let us know if that code works for you....."

I have not tested this code on ESP8266

Thanks for your answer best rgds Risto

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