Serial communication from Bean to iOS Swift 3

[rgold]

I am transmitting data from the Bean to an iOS app using serial communication.

My Bean code is:
void loop() {
int value = getValue();
Serial.write(value);
Bean.sleep(1000);
}

My iOS code is:
func bean(_ bean: PTDBean!, serialDataReceived serData: Data!) {
print (serData)
}

Looking at the output from the above print statement, it shows that only one byte was received, while I would expect to receive two bytes since I transmitted an Int. Even if I convert the output value to a Long, I only receive 1 byte.

However, if I change the Bean code to Serial.print(value), then everything works fine. I can convert that received value to a String and I see the values that I was expecting.

Once this problem is corrected, my next question is how to convert the received binary data into an int value in Swift 3. I have tried a number of ways, but it's not clear how to do this.

[rgold]

I better understand the problem now. I didn't realize that serial.write only outputs a single byte. If you want to transmit a long integer or float, you need to put the individual bytes into an array and then use:

serial.write(buf,length).

On the iOS side, the following works if you are transmitting an 8 bit, unsigned integer:
func bean(_ bean: PTDBean!, serialDataReceived serData: Data!) {
let receivedDataValue = serData.withUnsafeBytes { (ptr: UnsafePointer<UInt8>) -> UInt8 in
return ptr.pointee
}

       ` print (serData, receivedDataValue)`
    }