Norwegian HAN-interface - Kamstrup meter

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Basic receive logic:
Receive 1 byte with 1 second timeout

• In case of timeout, check if buffer is not empty and parse it
  
• Otherwise add byte to buffer
  

The third byte seems to be packet length without first/last 0x7E so you can use that to parse buffer with multiple messages in case they arrive together (10 second and 1 hour data).