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diff --git a/lumiax_bt.py b/lumiax_bt.py
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+++ b/lumiax_bt.py
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+import pygatt
+import sys
+import time
+
+VALID_HEADERS = (b"\x01\x03", b"\x01\x04")
+GET_STATUS = "fe043030002bab15"
+
+message_length = 0
+need_to_concat = False
+concat_timeout = 1
+start_time = 0
+data = b""
+
+
+def data_handler_cb(handle, value):
+   global data
+   global message_length
+   global need_to_concat
+   global start_time
+
+   # print(f"Handle: {handle}")
+   # value type is bytearray
+   value_string = value.hex()
+   print(f"Data: {value_string}")
+
+   # PV multi-line data handling
+   if value.startswith(VALID_HEADERS) and len(value) > 2:
+      data = b""
+      message_length = value[2]
+      print(f"message_length={message_length}")
+      
+      if (len(value)-5) < message_length:
+         start_time = time.time()
+         need_to_concat = True
+         print("Data detected. Next data will be concated")
+   
+#      # print(f"start_time={start_time}")
+#      # print(f"stop_time={start_time + concat_timeout}")
+#      data = ""
+     
+   if need_to_concat:
+      if time.time() <= (start_time + concat_timeout):
+         data = data + value
+      else:
+         need_to_concat = False
+         message_length = 0
+         print("Concat timeout occured. Concat aborted.")
+
+   # analyzing data
+   if (len(data) -5) == message_length:
+      need_to_concat = False
+      message_length = 0
+      print("Full data fetched. Concat finished.")
+         
+      print(f"batt SoC ={int.from_bytes(data[46:47], 'big')}")
+      print(f"PV V={int.from_bytes(data[63:65], 'big') / 100}")
+      print(f"PV A={int.from_bytes(data[65:67], 'big', signed=True) / 100}")
+      pv_w = int.from_bytes(data[67:69], 'big') / 100
+      print(f"PV W=\t{pv_w}")
+      pv_total = int.from_bytes(data[73:75], 'big') / 100
+      print(f"PV TOTAL=\t{pv_total}\tkWh")
+
+      print(f"BATT V={int.from_bytes(data[47:49], 'big') / 100}")
+      print(f"BATT A={int.from_bytes(data[49:51], 'big', signed=True) / 100}")
+      print(f"BATT temp={int.from_bytes(data[17:19], 'big') / 100}")
+
+      print(f"LOAD V={int.from_bytes(data[55:57], 'big') / 100}")
+      print(f"LOAD A={int.from_bytes(data[57:59], 'big', signed=True) / 100}")
+      load_w = int.from_bytes(data[59:61], 'big') / 100
+      print(f"LOAD W=\t{load_w}")
+      load_total = int.from_bytes(data[79:81], 'big') / 100
+      print(f"LOAD TOTAL=\t{load_total}\tkWh")
+
+   # print(f"time.time()={time.time()}")
+   # print(f"need_to_concat={need_to_concat}")
+   # print(f"concat_timeout={concat_timeout}")
+   # print(f"data={data}")
+
+def main():
+   adapter = pygatt.GATTToolBackend(hci_device=sys.argv[1])
+
+   try:
+      adapter.start()
+      print("adapter started")
+
+      device = adapter.connect(sys.argv[2]) 
+      print("connected")
+      device.subscribe('0000ff01-0000-1000-8000-00805f9b34fb', callback=data_handler_cb, indication=True)
+      print("subscribed")
+
+      # enable notifications
+      adapter.sendline('char-write-req 0x0012 0100') 
+
+      # get data
+      device.char_write_handle(0x0014, bytes.fromhex(sys.argv[3]))
+
+      time.sleep(1)
+      print("Script finished")
+      # print(f"data={data}")
+      # print(f"len(data)={len(data)}")
+
+   finally:
+      adapter.stop()
+      print("adapter stopped")
+
+   return 0
+
+if __name__ == '__main__':
+   exit(main())