Initial POC
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import os, serial, socket, subprocess, select, datetime, sys
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import argparse
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parser = argparse.ArgumentParser()
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parser.add_argument("--serial_port", default="/dev/serial/by-id/usb-Imaginaerraum.de_DoorControl_43363220195053573A002C0-if01")
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parser.add_argument("--nfc_fifo", default="/tmp/nfc_fifo")
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parser.add_argument("--control_socket", default="/tmp/nfc.sock")
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parser.add_argument("--valid_tokens", default="/etc/door_tokens")
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parser.add_argument("--log_file", default="/tmp/nfc.log")
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parser.add_argument("--state_timeout", type=float, default=10)
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parser.add_argument("--repeat_time", type=float, default=5)
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config = parser.parse_args()
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# Log data to stdout and the log file
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def log(*args):
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data = "%s %s" % (datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"), " ".join(i for i in args))
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lgf.write(data + "\n")
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lgf.flush()
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print(data)
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# Opens the socket that can control the daemon
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# Commands are TBD
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def open_control_socket():
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global control_socket
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global config
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global comm_channels
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if os.path.exists(config.control_socket):
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os.unlink(config.control_socket)
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control_socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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control_socket.bind(config.control_socket)
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control_socket.listen(5)
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comm_channels = []
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# Opens the serial port to talk to the lock actuator
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# Might return a failure. In that case, it will be tried again later
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def open_serial_port():
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global serial_port
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global config
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try:
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serial_port = serial.Serial(config.serial_port, timeout=2)
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except:
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serial_port = None
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pass
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# Detected tokens are passed in through a FIFO
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def open_nfc_fifo():
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global nfc_fifo
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global config
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nfc_fifo = open(config.nfc_fifo, "r")
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# Refresh valid tokens from the configured file
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def read_valid_tokens():
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global valid
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global config
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try:
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valid = [ s.strip() for s in open(config.valid_tokens, "r").readlines() ]
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except:
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valid = []
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log("No valid tokens")
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# Opens the log file for writing
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def open_logfile():
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global lgf
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global config
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lgf = open(config.log_file, "a+")
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# Actions
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IDLE, CLOSE, OPEN_THEN_CLOSE, OPEN, CLOSE_THEN_OPEN = range(5)
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# Current door state
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state = None
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# Current target action
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action = CLOSE
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# Start time of the current action
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start_time = datetime.datetime.now()
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# How often the action was repeated
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repeats = 0
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# Read the state of the door from the serial port
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def poll_door_state():
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global state
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global serial_port
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serial_port.reset_input_buffer()
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serial_port.write(b"R")
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data = serial_port.readline().strip().split()
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if data[0] == b'pos:':
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data = int(data[1])
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changed = False
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if data < 80 and door_state != OPEN:
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door_state = OPEN
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changed = True
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elif data > 100 and door_state != CLOSE:
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door_state = CLOSE
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changed = True
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else:
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print(data)
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return door_state
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# Check the door state and send commands through a state machine
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def handle_door_state():
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global action, target, serial_port, start_time, repeats
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state_names = {
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OPEN: "open",
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CLOSE: "close"
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}
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# Commands associated with each target state
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target_state_cmd = {
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OPEN: b'O',
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CLOSE: b'C'
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}
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old_state = state
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# If no serial port, try to open it or return
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if not serial_port:
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try:
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open_serial_port()
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except:
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return
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# Get new state
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poll_door_state()
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# Idle + change = key?
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if target == IDLE:
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if state != old_state:
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log("Door changed unexpectedly:", state_names[state])
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return
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# Target state, next action, timeout action
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actions = {
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OPEN: (OPEN, IDLE, CLOSE_THEN_OPEN ),
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CLOSE: (CLOSE, IDLE, OPEN_THEN_CLOSE ),
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OPEN_THEN_CLOSE: (OPEN, CLOSE, CLOSE ),
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CLOSE_THEN_OPEN: (CLOSE, OPEN, OPEN )
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}
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# Target state reached
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if state == actions[action][0]:
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# Select next action, reset start time and repetitions
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action = actions[action][1]
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start_time = datetime.datetime.now()
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repeats = 0
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# On idle, we're done
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if action == IDLE:
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log("Reached target position:", state_names[state])
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return
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# Execution time
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t = (datetime.datetime.now() - start_time)
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if t >= config.state_timeout:
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# Timeout -> switch to timeout action
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action = actions[action][2]
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start_time = datetime.datetime.now()
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repeats = 0
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log("Timeout. Switching to", action)
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elif t >= (1 + repeats) * config.repeat_time:
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# Repeat every couple of seconds
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repeats += 1
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serial_port.write(target_state_cmd[actions[action][0]])
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log("Repeating command:", target_state_cmd[actions[action][0]])
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def open_door():
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global action
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log("Opening the door")
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action = OPEN
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def close_door():
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global action
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log("Closing the door")
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action = CLOSE
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def toggle_door_state():
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global state, action
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if state == CLOSE:
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open_door()
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else:
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close_door()
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def handle_nfc_token():
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global valid
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token = nfc_fifo.readline()
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if token == "":
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open_nfc_fifo()
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token = token.strip()
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if token in valid:
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log("Valid token:", token)
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toggle_door_state()
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else:
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log("Invalid token:", token)
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open_logfile()
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read_valid_tokens()
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open_nfc_fifo()
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open_serial_port()
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open_control_socket()
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while True:
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readable = select.select([ nfc_fifo, control_socket ] + comm_channels, [], [], 0.5)[0]
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for c in readable:
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if c == nfc_fifo:
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handle_nfc_token()
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elif c == control_socket:
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comm_channels.append(control_socket.accept()[0])
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else:
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data = c.recv(1024)
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if len(data) == 0:
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comm_channels.remove(c)
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else:
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print("Got comms data: ", str(c.recv(1024)))
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c.sendall(b':)\n')
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