code: def _send_login(self):
          
          login_str = "user {0} pass {1} vers aprslib {3}{2}\r\n"
          login_str = login_str.format(
              self.callsign,
              self.passwd,
              (" filter " + self.filter) if self.filter != "" else "",
              __version__
              )
  
          self.logger.info("Sending login information")
  
          try:
              self._sendall(login_str)
              self.sock.settimeout(5)
              test = self.sock.recv(len(login_str) + 100)
              if is_py3:
                  test = test.decode('latin-1')
              test = test.rstrip()
  
              self.logger.debug("Server: %s", test)
  
              _, _, callsign, status, _ = test.split(' ', 4)
  
              if callsign == "":
                  raise LoginError("Server responded with empty callsign???")
              if callsign != self.callsign:
                  raise LoginError("Server: %s" % test)
              if status != "verified," and self.passwd != "-1":
                  raise LoginError("Password is incorrect")
  
              if self.passwd == "-1":
                  self.logger.info("Login successful (receive only)")
              else:
                  self.logger.info("Login successful")
  
          except LoginError as e:
              self.logger.error(str(e))
              self.close()
              raise
          except:
              self.close()
              self.logger.error("Failed to login")
              raise LoginError("Failed to login")
docs: Sends login string to server