AWS Documentation » AWS IoT » Developer Guide » Message Broker for AWS IoT » Protocols

Protocols

The message broker supports the use of the MQTT protocol to publish and subscribe and the HTTPS protocol to publish. Both protocols are supported through IP version 4 and IP version 6. The message broker also supports MQTT over the WebSocket protocol.

Protocol/Port Mappings

The following table shows each protocol supported by AWS IoT, the authentication method, and port used for each protocol.

Protocol, Authentication, and Port Mappings

Protocol	Authentication	Port	ALPN ProtocolName
MQTT	X.509 client certificate	8883, 443†	x-amzn-mqtt-ca
HTTPS	X.509 client certificate	8443, 443†	x-amzn-http-ca
HTTPS	SigV4	443	N/A
MQTT over WebSocket	SigV4	443	N/A

^†Clients that connect on port 443 with X.509 client certificate authentication must implement the Application Layer Protocol Negotiation (ALPN) TLS extension and use the ALPN ProtocolName listed above in the ALPN ProtocolNameList sent by the client as part of the ClientHello message.