Initial commit

dsmr_parser/serial.py

@@ -0,0 +1,55 @@
+import serial
+
+from dsmr_parser.parsers import TelegramParser
+
+SERIAL_SETTINGS_V4 = {
+    'baudrate': 115200,
+    'bytesize': serial.SEVENBITS,
+    'parity': serial.PARITY_EVEN,
+    'stopbits': serial.STOPBITS_ONE,
+    'xonxoff': 0,
+    'rtscts': 0,
+    'timeout': 20
+}
+
+
+def is_start_of_telegram(line):
+    return line.startswith('/')
+
+
+def is_end_of_telegram(line):
+    return line.startswith('!')
+
+
+class SerialReader(object):
+
+    def __init__(self, device, serial_settings, telegram_specification):
+        self.serial_settings = serial_settings
+        self.serial_settings['port'] = device
+        self.telegram_parser = TelegramParser(telegram_specification)
+
+    def read(self):
+        """
+        Read complete DSMR telegram's from the serial interface and parse it
+        into CosemObject's and MbusObject's
+
+        :rtype dict
+        """
+        with serial.Serial(**self.serial_settings) as serial_handle:
+            telegram = []
+
+            while True:
+                line = serial_handle.readline()
+                line = line.decode('ascii')
+
+                # Telegrams need to be complete because the values belong to a
+                # particular reading and can also be related to eachother.
+                if not telegram and not is_start_of_telegram(line):
+                    continue
+
+                telegram.append(line)
+
+                if is_end_of_telegram(line):
+                    yield self.telegram_parser.parse(telegram)
+                    telegram = []
+