Hi,

First, thanks a lot for this great project. It’s a piece of art 😉

My question/issue is about Sysex messages from arduino to breakoutjs. I don’t know if the behaviour is correct or not. I hope to explain correctly in english.

When I send Sysex commands from the browser to arduino, with a line as below:

// Javascript
arduino.sendSysex(0x01,[9,8,7,6,5,4,3,2,1]);

In the arduino side I have this code:

// Arduino
void sysexCallback(byte command, byte argc, byte*argv)
for (byte i=0;i<argc; i++){
lcd.print(argv[i], DEC);
}
}

I get the exact values in the LCD. ('987654321')

Right, my issue is when I send a Sysex message from Arduino to the browser. For example, if I send as below:

// Arduino
byte values[3] = {1,2,3};
Firmata.sendSysex(55, 3, values); // 55 is my custom command

In the browser I have this code:

// Javascript
function onSysexMessage(event) {

console.log("sysex received: " + event.message);

}

And I get in the console log:
[55, 1, 0, 2, 0, 3, 0]

MY QUESTION IS: Why I get that "0" between each value of the array? Is it normal?

Thank a lot in advance for your support.