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#!/usr/bin/env python3
import argparse
import asyncio
import json
import logging
import os
import sys
from pyA20.gpio import gpio
from pyA20.gpio import port
logger = logging.getLogger(__name__)
bus = None
lock = asyncio.Lock()
PIN = port.PA10
OFF = 1
ON = 0
async def relay_set(value):
async with lock:
gpio.output(PIN, value)
async def relay_get():
async with lock:
return int(gpio.input(PIN)) == ON
async def handle_client(reader, writer):
request = None
while request != 'quit':
try:
request = await reader.read(255)
if request == b'\x04':
break
request = request.decode('utf-8').strip()
except Exception:
break
data = None
if request == 'on':
await relay_set(ON)
logger.info('set on')
data = 'ok'
elif request == 'off':
await relay_set(OFF)
logger.info('set off')
data = 'ok'
elif request == 'get':
status = await relay_get()
data = 'on' if status is True else 'off'
writer.write(data + '\r\n').encode('utf-8'))
await writer.drain()
writer.close()
async def run_server(host, port):
server = await asyncio.start_server(handle_client, host, port)
async with server:
logger.info('Server started.')
await server.serve_forever()
if __name__ == '__main__':
if not os.getegid() == 0:
sys.exit('Must be run as root.')
parser = argparse.ArgumentParser()
parser.add_argument('--host', type=str, default='127.0.0.1')
parser.add_argument('--port', type=int, default=8307)
args = parser.parse_args()
logging.basicConfig(level=logging.INFO)
gpio.init()
gpio.setcfg(PIN, gpio.OUTPUT)
try:
asyncio.run(run_server(args.host, args.port))
except KeyboardInterrupt:
logging.info('Exiting...')
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