Changed the input of tedge operation template

Author: zhongys-c8y

operations/c8y_SetCoil.template

@@ -4,4 +4,4 @@
 
 [exec.workflow]
 operation = "modbus_SetCoil"
-input.c8y_SetCoil = "${.payload}"
+input = "${.payload}"

operations/c8y_SetRegister.template

@@ -4,4 +4,4 @@
 
 [exec.workflow]
 operation = "modbus_SetRegister"
-input.c8y_SetRegister = "${.payload}"
+input = "${.payload}"

tedge_modbus/reader/reader.py

@@ -469,7 +469,8 @@ def _handle_subscribed_message(self, topic, payload):
         try:
             payload_data = json.loads(payload)
         except json.JSONDecodeError as e:
-            self.logger.error("Failed to parse JSON payload: %s", e)
+            if payload != '':
+                self.logger.error("Failed to parse JSON payload: %s", e)
             return
 
         if payload_data["status"] == "init":
@@ -489,7 +490,7 @@ def _handle_subscribed_message(self, topic, payload):
                     "c8y_SetRegister" in payload_data
                     and payload_data["status"] == "executing"
                 ):
-                    register_data = payload_data["c8y_SetRegister"]["c8y_SetRegister"]
+                    register_data = payload_data["c8y_SetRegister"]
                     self.logger.debug("Register data: %s", register_data)
 
                     # Convert to JSON string for update_register.run
@@ -525,7 +526,7 @@ def _handle_subscribed_message(self, topic, payload):
             try:
                 # Extract c8y_SetCoil data from payload
                 if "c8y_SetCoil" in payload_data:
-                    coil_data = payload_data["c8y_SetCoil"]["c8y_SetCoil"]
+                    coil_data = payload_data["c8y_SetCoil"]
                     self.logger.debug("Coil data: %s", coil_data)
 
                     # Convert to JSON string for update_coil.run