Try to be a bit more resilient mqtt-side

src/main.rs

@@ -182,6 +182,7 @@ fn mqtt_connect(uri: String, client_id: String) -> Result<mqtt::Client, mqtt::Er
     let mqtt_opts = mqtt::CreateOptionsBuilder::new()
         .server_uri(uri)
         .client_id(client_id)
+        .send_while_disconnected(false)
         .finalize();
 
     // Create a client.
@@ -189,7 +190,7 @@ fn mqtt_connect(uri: String, client_id: String) -> Result<mqtt::Client, mqtt::Er
 
     // Define the set of options for the connection.
     let mqtt_conn_opts = mqtt::ConnectOptionsBuilder::new()
-        .keep_alive_interval(Duration::from_secs(20))
+        .keep_alive_interval(Duration::from_secs(5))
         .clean_session(true)
         .finalize();
 
@@ -245,6 +246,8 @@ fn main() {
 
     let mqtt_client = mqtt_connect(flags.mqtt_url, mqtt_client_id).unwrap();
 
+    // TODO: Publish Home Assistant autodiscovery message (retained)
+
     loop {
         match gather(&solax_url, &flags.solax_password) {
             Ok(msg) => {