Add postConnectErrorListener

 - listen and emit error that occurs when network error or unexpected RTP server errors
 - for example it handles ECONNRESET

lib/RTSPClient.ts

@@ -156,6 +156,12 @@ export default class RTSPClient extends EventEmitter {
         reject(err);
       };
 
+      const postConnectErrorListener = (err: any) => {
+        client.removeListener("error", postConnectErrorListener);
+        this.emit("error", err);
+        reject(err);
+      };
+
       const closeListener = () => {
         client.removeListener("close", closeListener);
         this.close(true);
@@ -183,6 +189,7 @@ export default class RTSPClient extends EventEmitter {
         this._client = client;
 
         client.removeListener("error", errorListener);
+        client.on("error", postConnectErrorListener);
 
         this.on("response", responseListener);
         resolve(this);
@@ -671,7 +678,7 @@ export default class RTSPClient extends EventEmitter {
     if (!this._client) {
       return;
     }
-    
+
     if (!isImmediate) {
       await this.request("TEARDOWN", {
         Session: this._session,