Fix sht21_hum device_class, data_sent/received availability (#236)

* corrected sht21_hum device_class to 'humidity'

* added availablility to data_sent/received sensors

Author: hcgraf

src/rpi-cpu2mqtt.py

@@ -576,7 +576,7 @@ def handle_specific_configurations(data, what_config, device):
         data["state_topic"] = config.mqtt_uns_structure + config.mqtt_topic_prefix + "/" + hostname + "/" + what_config + "_" + device
         data["unique_id"] = hostname + "_" + what_config + "_" + device
     elif what_config == "sht21_hum_status":
-        add_common_attributes(data, "mdi:water-percent", device + " " + get_translation("humidity"), "%", "temperature", "measurement")
+        add_common_attributes(data, "mdi:water-percent", device + " " + get_translation("humidity"), "%", "humidity", "measurement")
         data["state_topic"] = config.mqtt_uns_structure + config.mqtt_topic_prefix + "/" + hostname + "/" + what_config + "_" + device
         data["unique_id"] = hostname + "_" + what_config + "_" + device
     elif what_config == "data_sent":
@@ -794,13 +794,17 @@ def publish_to_mqtt(monitored_values):
         if config.discovery_messages:
             client.publish(f"{config.mqtt_discovery_prefix}/sensor/{config.mqtt_topic_prefix}/{hostname}_data_sent/config",
                            config_json("data_sent"), qos=config.qos)
+        if config.use_availability:
+            client.publish(f"{config.mqtt_uns_structure}{config.mqtt_topic_prefix}/{hostname}/data_sent_availability", 'offline' if monitored_values["data_sent"] is None else 'online', qos=config.qos)
         client.publish(f"{config.mqtt_uns_structure}{config.mqtt_topic_prefix}/{hostname}/data_sent",
                        monitored_values["data_sent"], qos=config.qos, retain=config.retain)
 
     if "data_received" in monitored_values:
         if config.discovery_messages:
             client.publish(f"{config.mqtt_discovery_prefix}/sensor/{config.mqtt_topic_prefix}/{hostname}_data_received/config",
                            config_json("data_received"), qos=config.qos)
+        if config.use_availability:
+            client.publish(f"{config.mqtt_uns_structure}{config.mqtt_topic_prefix}/{hostname}/data_received_availability", 'offline' if monitored_values["data_received"] is None else 'online', qos=config.qos)
         client.publish(f"{config.mqtt_uns_structure}{config.mqtt_topic_prefix}/{hostname}/data_received",
                        monitored_values["data_received"], qos=config.qos, retain=config.retain)