esp-mqtt/examples/mqtt_ssl_mutual_auth

ESPMQTT SSL Sample application

Navigate to the main directory

cd main

Generate a client key and a CSR. When you are generating the CSR, do not use the default values. At a minimum, the CSR must include the Country, Organisation and Common Name fields.

openssl genrsa -out client.key
openssl req -out client.csr -key client.key -new

Paste the generated CSR in the Mosquitto test certificate signer, click Submit and copy the downloaded client.crt in the main directory.