add configuration options to enable mqtt user login

rust/src/config.rs

@@ -11,6 +11,8 @@ pub struct NetworkConfig {
     pub password: Option<heapless::String<64>>,
     pub mqtt_url: Option<heapless::String<128>>,
     pub base_topic: Option<heapless::String<64>>,
+    pub mqtt_user: Option<heapless::String<32>>,
+    pub mqtt_password: Option<heapless::String<64>>,
     pub max_wait: u32,
 }
 impl Default for NetworkConfig {
@@ -21,6 +23,8 @@ impl Default for NetworkConfig {
             password: None,
             mqtt_url: None,
             base_topic: None,
+            mqtt_user: None,
+            mqtt_password: None,
             max_wait: 10000,
         }
     }

rust/src/hal/esp.rs

@@ -419,6 +419,8 @@ impl Esp<'_> {
             }),
             client_id: Some("plantctrl"),
             keep_alive_interval: Some(Duration::from_secs(60 * 60 * 2)),
+            username: network_config.mqtt_user.as_ref().map(|v| &**v),
+            password: network_config.mqtt_password.as_ref().map(|v| &**v),
             //room for improvement
             ..Default::default()
         };