Prepare the path for OTA implementation

central_backend/src/app_config.rs

@@ -293,6 +293,16 @@ impl AppConfig {
     pub fn log_of_day(&self, day: u64) -> PathBuf {
         self.logs_dir().join(format!("{day}.log"))
     }
+
+    /// Get the directory that will store OTA updates
+    pub fn ota_dir(&self) -> PathBuf {
+        self.logs_dir().join("ota")
+    }
+
+    /// Get the directory that will store OTA updates of a given device reference
+    pub fn ota_of_device(&self, dev_ref: &str) -> PathBuf {
+        self.ota_dir().join(dev_ref)
+    }
 }
 
 #[cfg(test)]