I want to communicate data with M5stack Core2 and COM.Sigfox.

[takero]

Hello. I bought M5stack Core2 and COM.Sigfox. I want to use this for data communication.
I was able to register the module in the sigfox backend. But I can't communicate or call back.
When I use M5stack Basic and COM.Sigfox,I can do data communication and callbacks.
Is there something wrong with my sketch?

#include <M5Core2.h>

void setup() {
 M5.begin(true, false, true);
 Serial2.begin(9600, SERIAL_8N1, 13, 14);
 Serial.begin(9600);
 }

void loop() {
 int val = 11223344;
 String msg = String(val, HEX);
 Serial.print( msg);  Serial.println(" msg ");
 Serial2.print("AT$SF=" + msg);
 Serial.print("AT$SF=" + msg);  Serial.println(" AT$SF= msg ");
 delay(15*1000);
}

[felmue]

Hello @takero

in this example sending a command uses Serial2.write("AT$SF=00FFEE\r\n"); instead of print(). In another example I found println() was used.

I have a feeling the COM.Sigfox module would like a \r\n as a line end. (But that is just a guess as I don't have that module and cannot test myself.)

Good luck!
Felix

[takero]

@felmue
Thank you for suggestion Felix.　And Sorry for my late reply.
I tried Serial2.println("AT$SF=" + msg );.
or Serial2.println("AT$SF= + msg ");.

and Serial2.write("AT$SF= + msg ");.
or Serial2.write("AT$SF=" + msg );.

But I couldn't communicate.
If you have new tips, I would love to try.

Thank you.

[felmue]

Hello @takero

have you tried the example I've mentioned? This should read and display the SigfoxID and PACNumber and if successful would tell you the hardware is ok.

Note: for M5Core2 you'll need to adapt rxPin to 13 and txPin to 14 as before.

Thanks
Felix

[takero]

@felmue Thank you.
I tried your sample. I succeeded in compiling.
But I can't write to core2 since yesterday.

Displayed "A fatal error occurred: Failed to connect to ESP32: Timed out Waiting for packet header"

Both of the Core2 I have are like that. Did my Core 2 break?
I just wrote a sketch.

Thank you.

[felmue]

Hello @takero

sorry to hear. It's very unlikely that both of your M5Core2 devices just broke like that. Some suggestions:

• Have you tried a different USB cable?
• Have you tried a different USB port?
• Have you tried closing and reopening your software?
• Have you tried to reboot your computer?

Thanks
Felix

[takero]

Thank you @felmue .I have tried your suggestion.

Have you tried a different USB cable? :Yes I did.
Have you tried a different USB port? :Yes I did.
Have you tried closing and reopening your software? :Yes I did.
Have you tried to reboot your computer? :Yes I did.

However, I got an error. Isn't my Core 2 broken ?

I tried another sketch and the result was the same.
At that time, I connected the actual sensor.
DHT22 to GPIO72.
DS18B20 to GPIO26.
Analog sensor to GPIO36.
Is that not good?
Thank you.

[felmue]

Hello @takero

until you have figured out the issue regarding flashing a sketch (any sketch) onto your M5Core2, I'd do the following:

• only connect the USB cable to your computer
• disconnect everything else
• try flashing a sketch
  If that doesn't work, then maybe your M5Core2 has been damaged (still very unlikely though).
  Thanks
  Felix

[takero]

@felmue
While I was writing to Core 2, I pressed the power button for a long time and the writing was successful.

Thank you.