fix: fixed an error in MQTT asset connection since all data must be sent in string format

Author: ekhurtado

pyproject.toml

@@ -8,7 +8,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "smia"
-version = '0.3.2.5'  # cambiar cuando funcione a 0.3.2
+version = '0.3.2.6'  # cambiar cuando funcione a 0.3.2
 authors = [{ name="Ekaitz Hurtado", email="ekaitz.hurtado@ehu.eus" },]
 description = "Self-configurable Manufacturing Industrial Agents (SMIA)."
 readme = 'README_pypi.md'

src/smia/assetconnection/mqtt_asset_connection.py

@@ -228,14 +228,13 @@ async def serialize_data_by_content_type(self, interaction_metadata, service_dat
 
         match content_type.value:
             case 'application/json':
-                # return json.dumps(service_data)   # TODO ANALIZAR SI ES NECESARIO ENVIARLO EN STRING CON aiomqtt
-                return service_data
+                return json.dumps(service_data)   # Data should be sent in string format
             case 'text/plain':
                 return json.dumps(service_data)
             case 'application/xml':
                 pass  # Add the method to convert a JSON into XML
             case _:
-                return service_data
+                return str(service_data)
 
     async def send_mqtt_request(self):
         """