Migrate to git

emz-poll.service

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+[Unit]
+Description=EMZ Poller Service
+After=syslog.target
+
+[Service]
+Type=simple
+User=pi
+Group=pi
+WorkingDirectory=/opt/emz_poll
+ExecStart=python3 /opt/emz_poll/emz_poll.py
+SyslogIdentifier=emz-poll
+StandardOutput=syslog
+StandardError=syslog
+Restart=always
+RestartSec=3
+
+[Install]
+WantedBy=multi-user.target

emz_poll.py

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+import requests
+import xml.dom.minidom
+import time
+import logging
+import sys
+
+from pymodbus.client.sync import ModbusTcpClient
+from pymodbus.exceptions import ConnectionException
+
+client = None
+inputs = dict()
+failure = True
+
+logger = logging.getLogger()
+logger.setLevel(logging.INFO)
+#logger.setLevel(logging.DEBUG)
+
+handler = logging.StreamHandler(sys.stdout)
+handler.setLevel(logging.DEBUG)
+formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
+handler.setFormatter(formatter)
+logger.addHandler(handler)
+
+
+def write_coil(nr, value):
+  while True:
+    try:
+      client.write_coil(nr, value, unit=1)
+      return
+    except ConnectionException:
+      print("Error writing to Modbus, retrying...")
+      time.sleep(5)
+
+
+def poll():
+  global failure
+
+  try:
+    r = requests.get("http://192.168.43.100/input_emz.xml", timeout=5)
+  except Exception:
+    logger.debug("Could not get data from EMA. Sending error state!")
+    write_coil(501, False)
+    failure = True
+    return
+
+  if failure:
+     write_coil(501, True)
+     failure = False
+
+  with xml.dom.minidom.parseString(r.text) as dom:
+    for inp in dom.getElementsByTagName('Input'):
+      nr = inp.getAttribute('nr')
+      led = inp.getElementsByTagName('Led')
+      if len(led):
+        led = led[0].firstChild.nodeValue
+        value = False
+        if led == "RED_ON":
+          value = True
+        if nr not in inputs or inputs[nr] != value:
+          inputs[nr] = value
+          offset = 399+int(nr)
+          logger.info('EMZ-MG: ' + str(nr) + " --> Modbus Coil: " + str(offset) + " State: " + str(value))
+          write_coil(int(offset), value)
+
+
+def loop():
+  global client
+  try:
+    logger.info("Starting EMZ Poller...")
+    client = ModbusTcpClient('192.168.43.1')
+
+    while True:
+      logger.debug("Polling...")
+      poll()
+      time.sleep(1)
+
+  except KeyboardInterrupt:
+    raise SystemExit(0)
+  finally:
+    if client is not None:
+      client.close()
+
+if __name__ == "__main__":
+  loop()

requirements.txt

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+requests
+xml.dom.minidom
+time
+logging
+sys