How to send data from bolt cloud to server. I have sent the MQ7 data from arduino UNO to BOLT cloud and now I want that same data on the Server

niravgaglani6268 · July 10, 2021, 7:10am

Can you tell the cause of these error:

“Invalid literal for int() with base 10”

akshayan.sinha · July 10, 2021, 7:13am

That is not the issue. Its a null value. Nothing is in the serialRead. That’s it.

I am trying to figure out why the data is not visible on the monitor, but it is available on the cloud.

niravgaglani6268 · July 10, 2021, 8:01am

Its available on cloud because I’ve written “boltiot.processPushDataCommand(ppm)”

niravgaglani6268 · July 10, 2021, 8:04am

Also I noticed that, I am getting the Data on monitor(PuTTY) when I am NOT using the “boltiot.processPushDataCommand(ppm)”

Is it so that “we cannot use the setStringCommand and processPushDataCommand together in one Code” ?

akshayan.sinha · July 10, 2021, 8:30am

You had both of them in the program? They mentioned in the document about it. processpushDataCommand and handle command does the same job, but different methods.

I thought you were following this the whole time.

akshayan.sinha:

String getAnalogData(String *data){
  String retval=analogRead(<gas sensor pin>);
  return retval;
}
void setup(){
  boltiot.begin(Serial);
  boltiot.setCommandString("RD\r",pushData);
  boltiot.setCommandString("GetAnalogData",getAnalogData);
}
void loop(){
  boltiot.handleCommand();
}

Anyways, is your serialRead returning the values?

niravgaglani6268 · July 10, 2021, 9:22am

Yeah, sorry for that.
Yes, it is returning values in the monitor, but now it is not showing the Graph, I think I’ve created a mess.

akshayan.sinha · July 10, 2021, 9:26am

You’re sending data to both cloud and your python. I told you in the beginning, both of them do the same job, i.e. run API requests and take values. Those values can be altered by us for viewing or doing anything.

Cloud surely is compatible with processpushdataCommand, while other API requests in JSON format can be helped with handleCommand.

Its okay where you are right now, Python has many capabilities, one of them is making graphs. You can use your data to be stored in a temporary folder and use that data to build the graph as your python is running.

niravgaglani6268 · July 10, 2021, 9:30am

with setStringCommand, can I send a value Stored in variable ppm, into the python code ?

akshayan.sinha · July 10, 2021, 9:34am

It will go by the means of serial communication. You send whatever you wish. VALUE, STRING, DATA, It has to be in the form of numbers and strings only. Your python code has to be good enough to understand what the data sent by the arduino really means.

niravgaglani6268 · July 10, 2021, 9:45am

Again facing some issue, it showed sensor data 2 times, then it again returns error

niravgaglani6268 · July 10, 2021, 9:46am

Yes, I was following this, but I did not knew that I need to remove the pushDatacommand, which I wrote earlier…

akshayan.sinha · July 10, 2021, 10:16am

It’s fine. Your data was read once right. After that, maybe your arduino did not send any data.

On your serial monitor, it has to be like -

66
66

And after that, no data was put on the serial communication. I hope you understood this part.

Now, add an if statement, to print(“No input”), when

if (not sensor_value):

OR

if (len(sensor_value) == 0):

akshayan.sinha · July 10, 2021, 10:18am

You can do any other function or keep sensing with continue, instead of printing

niravgaglani6268 · July 10, 2021, 11:44am

Hey, it has started displaying the values…but it is also printing the error message along…

niravgaglani6268 · July 10, 2021, 11:48am

look, something very Strange happened: Why??

akshayan.sinha · July 10, 2021, 11:51am

Yeah, that’s because your sensor value is integer, but it is also reading ‘\n’ and sometimes null with it.

akshayan.sinha · July 10, 2021, 11:52am

You are using Free plan of bolt right? That’s why. Get the BoltCloud Pro plan when possible.
For more info - https://docs.boltiot.com/docs/api-access-rules

akshayan.sinha · July 10, 2021, 11:57am

Right now, i can ask you to either use string, which will restrict you from using the threshold feature, or remove the try - catch block which wont show you future errors.

niravgaglani6268 · July 10, 2021, 1:43pm

Thanks brother, it has been resolved, turns out int() does not accept strings which are in float form, using float() worked

akshayan.sinha · July 10, 2021, 1:45pm

What about ‘\n’ that isn’t disturbing the flow, right?