fix: add option to reconnect if connack has an error code

fixes #1947

src/lib/client.ts

@@ -162,6 +162,12 @@ export interface IClientOptions extends ISecureClientOptions {
 	 * 1000 milliseconds, interval between two reconnections
 	 */
 	reconnectPeriod?: number
+	/**
+	 * Set to true to enable the reconnect period to apply if the initial
+	 * connection is denied with an error in the CONNACK packet, such as with an
+	 * authentication error.
+	 */
+	reconnectOnConnackError?: boolean
 	/**
 	 * 30 * 1000 milliseconds, time to wait before a CONNACK is received
 	 */

src/lib/handlers/connack.ts

@@ -49,6 +49,9 @@ const handleConnack: PacketHandler = (client, packet: IConnackPacket) => {
 			rc,
 		)
 		client.emit('error', err)
+		if (client.options.reconnectOnConnackError) {
+			client['_cleanUp'](true)
+		}
 	}
 }