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@junym there is a note on AWS site for port 443: Clients wishing to connect using MQTT with X.509 Client Certificate authentication on port 443 must implement the Application Layer Protocol Negotiation (ALPN) TLS extension and pass x-amzn-mqtt-ca as the ProtocolName in the ProtocolNameList. Note that ALPN is not required to open connections using MQTT with X.509 Client Certificate authentication on port 8883.
WiFi connected
IP address:
192.168.0.148
Heap: 45744
Success to open cert file
cert loaded
Success to open private cert file
private key loaded
Heap: 40224
Attempting MQTT connection...pm open,type:2 0
failed, rc=-4 try again in 5 seconds
Attempting MQTT connection...failed, rc=-4 try again in 5 seconds
Cannot Connect to Device....Please guide !!
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