MicroPython Forum (Archive)

Posted: **Sun Dec 29, 2019 2:38 am**

I need to read from the socket and cannot use readline() as it is possible that the data does not contain line endings, in which case it will wait forever.

So I am reading into a byte string as per the code below, however I realise that using a byte string may not be as efficient as reading into a buffer which I have no experience with.

The following code works, but is the method I am using the best way to do this ?? - I need to be able to read by length, line and to pop the data off the buffer after reading it.

Code: Select all

inbuf = b''

def read():
  inbuf += self.sock.read()
  return len(self.inbuf)

def readbuf(size=0,pop=True,line=False):
  os = 0
  if line:
    os=2
    size = inbuf.find(b'\r\n')
    if size < 0: size = 0
  data = inbuf[:size]
  if pop: inbuf = self.inbuf[size+os:]
  return data

Posted: **Sun Dec 29, 2019 6:23 am**

This is an attempt at readline using a byte array:

Code: Select all

a = bytearray(b'0123\r\n45678\r\n9\r\n\r\n')
def readline():
	global a
	data=a
	old=None
	for i in range(len(a)):
		new = a[i]
		if old == 13 and new == 10:
			data = a[:i-1]
			a=a[i+1:]
			return data
		old = new
	a = bytearray()
	return data

>>> readline()
bytearray(b'0123')
>>> readline()
bytearray(b'45678')
>>> readline()
bytearray(b'9')
>>> readline()
bytearray(b'')
>>>

Same question, is there a better way ??

Posted: **Sun Dec 29, 2019 7:19 am**

OK, forget these requests for help, I have solved the problem by using select.poll() on the socket.readline()

MicroPython Forum (Archive)

reading socket into buffer and then reading buffer by line

reading socket into buffer and then reading buffer by line

Re: reading socket into buffer and then reading buffer by line

Re: reading socket into buffer and then reading buffer by line