added a script just to retrieve the mac address

pyheatpump/get_mac_address.py

@@ -0,0 +1,19 @@
+#!/usr/bin/python3
+import sys
+def mac_address_init():
+    from netifaces import gateways, ifaddresses, AF_INET, AF_LINK
+
+    interface = gateways()['default'][AF_INET][1]
+    if len(ifaddresses(interface)) == 0:
+        sys.exit(1)
+
+    if len(ifaddresses(interface)[AF_LINK]) == 0:
+        sys.exit(1)
+
+    addr = ifaddresses(interface)[AF_LINK][0]['addr']
+    print(f'Got new mac address {addr}')
+    return addr
+
+if __name__ == "__main__":
+    mac_address_init()
+