Check for conflicting port usage during start of instance

README.md

@@ -144,7 +144,7 @@ More to come. Stay tuned.
 -->
 ### **WORK IN PROGRESS**
 * (MyHomeMyData) Changed default port to 3100 to avoid conflict with camera adapter
-* (MyHomeMyData) Check for conflicting port usage during start of instance (not working yet)
+* (MyHomeMyData) Check for conflicting port usage during start of instance
 
 ### 0.0.3 (2024-08-25)
 * (MyHomeMyData) Disabled sinon should interface

main.js

@@ -52,7 +52,7 @@ class Flexcharts extends utils.Adapter {
 		this.startWebServer();
 	}
 
-	startWebServer(adapter) {
+	async startWebServer(adapter) {
 		this.log.debug(`Starting web server on http://localhost:${this.config.port}/`);
 
 		// Tools to select MIME-type based on file extension
@@ -185,13 +185,16 @@ class Flexcharts extends utils.Adapter {
 		});
 
 		// Start server
-		try {
+		const check_port = await this.getPortAsync(Number(this.config.port));	// Returns next available port number
+		if (check_port == Number(this.config.port)) {
+			// Requested port is available
 			this.webServer.listen({port: this.config.port}, () => {
 				this.log.info(`Server started on localhost:${this.config.port}`);
 				this.setState('info.connection', true, true);
 			});
-		} catch (e) {
-			this.log.error(`Start of http server failed on localhost:${this.config.port} - err=${e.message}`);
+		} else {
+			// Error: Requested port is already in use.
+			this.log.error(`Start of http server failed on localhost:${this.config.port}. Port is already in use. Next available port is ${check_port}. Pls. change port in configuration of instance.`);
 			this.setState('info.connection', false, true);
 		}
 }