working mqtt now

mqtt/build.rs

@@ -1,7 +1,8 @@
 fn main() {
-    // load .env and pass SSID/PASSWORD to compiler
-    if let Ok(dotenv_path) = dotenvy::dotenv() {
-        // Only rebuild if .env changes
+    // Explicitly load .env from the project root, even when called from other dirs
+    let project_root = std::env::var("CARGO_MANIFEST_DIR").unwrap();
+    let dotenv_path = std::path::Path::new(&project_root).join(".env");
+    if dotenvy::from_path(dotenv_path.clone()).is_ok() {
         println!("cargo:rerun-if-changed={}", dotenv_path.display());
     }
 
@@ -12,8 +13,6 @@ fn main() {
     if let Ok(password) = std::env::var("PASSWORD") {
         println!("cargo:rustc-env=PASSWORD={}", password);
     }
-
-    // Export BROKER_IP and PORT as string envs also (optional, for debugging)
     if let Ok(ip) = std::env::var("BROKER_IP") {
         println!("cargo:rustc-env=BROKER_IP={}", ip);
     }
@@ -22,7 +21,7 @@ fn main() {
     }
 
     linker_be_nice();
-    // make sure linkall.x is the last linker script
+
     println!("cargo:rustc-link-arg=-Tlinkall.x");
 }