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AT.py
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AT.py
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#! /usr/bin/env python
# encoding: utf-8
"""
Example of a AT command protocol.
https://en.wikipedia.org/wiki/Hayes_command_set
http:https://www.itu.int/rec/T-REC-V.250-200307-I/en
Code is taken from:
https://github.com/pyserial/pyserial/blob/master/examples/at_protocol.py
"""
import sys
sys.path.insert(0, '..')
import time
import logging
import binascii
import serial
import serial.threaded
import threading
try:
import queue
except ImportError:
import Queue as queue
class ATException(Exception):
pass
class ATProtocol(serial.threaded.LineReader):
TERMINATOR = b'\r\n'
def __init__(self):
super(ATProtocol, self).__init__()
self.alive = True
self.responses = queue.Queue()
self.events = queue.Queue()
self._event_thread = threading.Thread(target=self._run_event)
self._event_thread.daemon = True
self._event_thread.name = 'at-event'
self._event_thread.start()
self.lock = threading.Lock()
self.unhandled_events = queue.Queue()
def stop(self):
"""
Stop the event processing thread, abort pending commands, if any.
"""
self.alive = False
self.events.put(None)
self.responses.put('<exit>')
def _run_event(self):
"""
Process events in a separate thread so that input thread is not
blocked.
"""
while self.alive:
try:
self.handle_event(self.events.get())
except:
logging.exception('_run_event')
def handle_line(self, line):
"""
Handle input from serial port, check for events.
"""
if line.startswith('+'):
self.events.put(line)
else:
self.responses.put(line)
def handle_event(self, event):
"""
Spontaneous message received.
"""
print('event received:', event)
def command(self, command, response='OK', timeout=5):
"""
Set an AT command and wait for the response.
Args:
command: AT command
response: expected response
timeout: timeout
Returns:
List of read preceding lines before response
Raises:
ATException: In case of timeout
"""
# ensure that just one thread is sending commands at once
with self.lock:
# print("CMD: {}".format(command))
self.write_line(command)
lines = []
while True:
try:
line = self.responses.get(timeout=timeout)
# print("{}".format(line))
if line == response:
return lines
else:
lines.append(line)
except queue.Empty:
raise ATException('AT command timeout ({!r})'.format(
command))
def read_until(self, pattern='OK', timeout=5):
lines = []
while True:
try:
line = self.unhandled_events.get(timeout=timeout)
# print("{}".format(line))
if pattern in line:
return lines
else:
lines.append(line)
except queue.Empty:
raise ATException(
'Pattern not found. Timeout ({!r}).\n{}'.format(
pattern, lines))
class IDW01M1(ATProtocol):
"""
AT interface for ST Wi-Fi expansion board X-NUCLEO-IDW01M1
https://os.mbed.com/components/X-NUCLEO-IDW01M1/
"""
def __init__(self):
super(IDW01M1, self).__init__()
self.event_responses = queue.Queue()
self._awaiting_response_for = None
def connection_made(self, transport):
super(IDW01M1, self).connection_made(transport)
# our adapter enables the module with RTS=low
self.transport.serial.rts = False
time.sleep(0.3)
self.transport.serial.reset_input_buffer()
def handle_event(self, event):
"""Handle events and command responses starting with '+...'"""
if event.startswith('+RRBDRES') and self._awaiting_response_for.startswith('AT+JRBD'):
rev = event[9:9 + 12]
mac = ':'.join('{:02X}'.format(ord(x)) for x in rev.decode('hex')[::-1])
self.event_responses.put(mac)
else:
self.unhandled_events.put(event)
logging.warning('unhandled event: {!r}'.format(event))
def command_with_event_response(self, command):
"""Send a command that responds with '+...' line"""
# ensure that just one thread is sending commands at once
with self.lock:
self._awaiting_response_for = command
self.transport.write(b'{}\r\n'.format(
command.encode(self.ENCODING, self.UNICODE_HANDLING)))
response = self.event_responses.get()
self._awaiting_response_for = None
return response
def write(self, data):
with self.lock:
self.write_line(data)
def send_at(self):
"""Send `AT` command and do nothing
"""
self.command("AT")
def configure_wifi(self, ssid, password, priv_mode=2, wifi_mode=1):
"""Configure module to connect specific Wi-Fi AP
Args:
ssid: Name of the AP
password: password for the AP
priv_mode: Network privacy mode 0 - none, 1 - WEP, 2 -
WPA-Personal (TKIP/AES) or WPA2-Personal(TKIP/AES)
wifi_mode: Network mode 1 - STA, 2 - IBSS, 3 - MiniAP
"""
self.command("AT+S.SSIDTXT={}\r\n".format(ssid))
self.command("AT+S.SCFG=wifi_wpa_psk_text,{}\r\n".format(password))
self.command("AT+S.SCFG=wifi_priv_mode,{}\r\n".format(priv_mode))
self.command("AT+S.SCFG=wifi_mode,{}\r\n".format(wifi_mode))
def save_configuration(self):
self.command("AT&W")
def reset(self):
self.command("AT+CFUN=1", response='')
def get_file_list(self):
return list(filter(None, self.command("AT+S.FSL")))
def erase_extmem(self):
self.command('AT+S.HTTPDFSERASE')
def update_fs(self, host, img_name):
self.command('AT+S.HTTPDFSUPDATE={},{}'.format(host, img_name),
response='')