[newbie] trying socket as a replacement for nc

[Jean-Michel Pichavant]

> Did you try
> 
> import telnetlib
> 
> ?
> 
> Note that in the code above I forgot the EOF, which is very much
> dependent of the equipment itself.
> 
> You may have to write
> t.write('*IDN?\n')
> or
> t.write('IDN?\n\r')
> 
> JM


Additionally, here's the code we're using for our signal generators, just to give you a broad idea:

	def getError(self):
		error = self._extractRsp(self._sendCmd('SYST:ERR?', 10))
		if '"No error"' in error:
			return None
		else:
			return error

	def _sendCmd(self, aCmd, timeout):
		self.send(str(aCmd) + self.SEND_LFCR)

		waitPattern = [self.PROMPT]
		try:			
			index, _, rsp= self._telnet.expect(waitPattern, timeout)
		except  EOFError:
			self._logger.error('Connection unexpectedly closed while sending/reading/ data.')
			raise MxgError('Connection unexpectedly closed while sending the command "%s"' % aCmd)

		if index == -1:
			raise MxgError('Timeout occurred while sendind the command "%s"' % aCmd)

		return rs


	def _extractRsp(self, rawRsp):
		# the returned string should be something like '\r\n<response>\r\n<prompt>'
		# or '\r\n<prompt>'
		# tries to extract the response only, removing the additional carriage returns and prompt
		rawRsp = rawRsp.replace(self.READ_LFCR+self.PROMPT, '')
		if rawRsp.startswith(self.READ_LFCR):
			rawRsp = rawRsp[2:]
		return rawRs


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