We're trying to test mutual TLS authentication with the XBee3 Cellular modules (both the CAT1 and the LTE-M), and we're starting out with self-signed certificates for both the server and client certificates for our test server. We're having authentication issues and we believe one issue that we don't know the correct way to create self-signed certificates using openssl.
Does anyone have an example of how to use openssl to create a self-signed server certificate and client certificates that will work with the Xbee Cellular modems?