Sending string to serial.to_bytes not working

Question

I am trying to send a string variable contains the command.

Like this:

value=\"[0x31, 0x0a, 0x32, 0x0a, 0x33, 0x0a]\"
self.s.write(serial.to_bytes(value)         


        

Answer 1

serial.to_bytes takes a sequence as input. You should remove double quotes around value to pass a sequence of integers instead of a str representing the sequence you want to pass:

value = [0x31, 0x0a, 0x32, 0x0a, 0x33, 0x0a]
self.s.write(serial.to_bytes(value))  # works now

In the first case, you sent a sequence of bytes representing "[0x31, 0x0a, 0x32, 0x0a, 0x33, 0x0a]". Now, you will send the sequence [0x31, 0x0a, 0x32, 0x0a, 0x33, 0x0a] as expected.

---

If you want to send a string, just send it as bytes:

# Python 2
self.s.write('this is my string')
text = 'a string'
self.s.write(text)

# Python 3
self.s.write(b'this is my string')
text = 'a string'
self.s.write(text.encode())

And for a sequence:

for value in values:
    # Python 2
    self.s.write(value)

    # Python 3
    self.s.write(value.encode())