diff --git a/Dockerfile b/Dockerfile
index cc7c34d..622d424 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,7 +12,8 @@ RUN apt-get update \
         git \	
         libbluetooth3 \
         libbluetooth-dev \
-        python-dev \
+        #python-dev \
+        python-dev-is-python3 \
     && pip install -r requirements.txt \
     && pip install git+https://github.com/pybluez/pybluez \
     && git clone https://github.com/colin-guyon/py-bluetooth-utils.git --depth=1 \
diff --git a/mi_atc_reader.py b/mi_atc_reader.py
index 1bcaa89..4ccbd1a 100644
--- a/mi_atc_reader.py
+++ b/mi_atc_reader.py
@@ -56,7 +56,10 @@ def le_advertise_packet_handler(mac, adv_type, data, rssi):
     Both atc1441 and pvvx forks send data on GATT Service 0x181A Environmental Sensing
     """
     exit_stat = not exit_event.is_set()
-    if struct.unpack('<H', data[3:5])[0] != 0x181A:
+    if adv_type != 0x00: #check if its ADV_IND: Connectable Scannable Undirected advertising.
+        return exit_stat
+    
+    if len(data) > 6 and struct.unpack('<H', data[3:5])[0] != 0x181A:
         return exit_stat
 
     # data format adds mac as part of data structure.