Norwegian HAN-interface - Kamstrup meter

[admin]

Your example already does what I've suggested. The only slight improvement is to use a table to buffer data.

Code:

-- Check if port is open, open serial port if not
if not port then
  require('serial')
  port = serial.open('/dev/ttyUSB0', { baudrate = 2400 })
  port:flush()
  buffer = {}
end

-- Read on byte, or time out after 1 sec
char = port:read(1, 1)

if char then
  buffer[ #buffer + 1 ] = char
elseif #buffer > 0 then
  data = table.concat(buffer)
  -- parse(data)
  loghex(data)
  buffer = {}
end