update serialization

common/src/lib.rs

@@ -8,7 +8,7 @@ pub mod metrics;
 pub const MQTT_TOPIC: &str = "system/metrics";
 pub const MQTT_SEND_INTERVAL: u64 = 5;
 
-#[derive(Debug, Serialize, Deserialize)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct StatusMessage {
     pub agent: String,
     pub metrics: Metrics,
@@ -36,3 +36,9 @@ impl<'a> TryFrom<&'a [u8]> for StatusMessage {
         serde_json::from_slice(value)
     }
 }
+
+impl From<StatusMessage> for String {
+    fn from(msg: StatusMessage) -> String {
+        serde_json::to_string(&msg).unwrap_or_else(|_| String::new())
+    }
+}