# Set Up MQTT Explorer Download and install the MQTT Explorer from https://mqtt-explorer.com/ Setting up MQTT Explorer for testing.  ## Connecting to MQTT Server ### Connecting to AWS - Host : Your Host name (examples: a2m21kovu9tcsh-ats.iot.ap-southeast-1.amazonaws.com) - Port : 8883 - Make sure you enable `Validate Certificate and Encryption` - Click on the `Advanced Settings`  - Add topics as shown (#, light/*, test_publish ) - MQTT Client ID depends on the certificate set that you will use. - Add the Certificate, following step 7 in [AWS installation](./AWS_CONFIGURATION_REGISTRATION.md)  - Once the above steps are done, try connecting to AWS.  ### Connecting to Mosquitto Connection - Host : Your Mosquitto ip address - Port : 8883 - Make sure you enable Validate Certificate and Encryption - Click on the `Advanced Settings`  - Add topics as shown (#, light/*, test_publish ) - MQTT Client ID depends on the certificate set that you will use. - Add the Certificate, following step 5 in [openssl certificate create](./OPENSSL_CERTIFICATE_CREATION.md) 