added command parameter to identify extenral cmds

pus_tc/devs/heater.py

@@ -46,6 +46,10 @@ class Info:
     HEATER_HEALTHY_CMD = "Set to healthy"
 
 
+# Needed in OBSW to differentiate between external and internal heater commands
+COMMAND_SOURCE_PARAM_EXTERNAL = 1
+
+
 class ActionIds(enum.IntEnum):
     SWITCH_HEATER = 0
 
@@ -214,6 +218,7 @@ def pack_switch_heater_command(
     command = bytearray()
     command.append(switch_nr)
     command.append(switch_action)
+    command.append(COMMAND_SOURCE_PARAM_EXTERNAL)
     return generate_action_command(
         object_id=object_id, action_id=ActionIds.SWITCH_HEATER, app_data=command
     )