in src/IoTModule.tsx [6:13]
export function init(awsIotClient : AwsIotClient) {
iotClient = awsIotClient;
iotClient.on("connect", window.onConnectHandler);
iotClient.subscribe('iot/meeting/#');
iotClient.on("reconnect", window.onReconnectHandler);
iotClient.on("message", window.onMessageHandler);
}