Solved
From "Help Center" - "Using SSL/TLS for Security": https://support.ptc.com/help/thingworx/edge_sdk_c/en/index.html#page/c_sdk/c_csdk_tls_implementation.html
Articles:
- "Configuring ThingWorx Platform to use SSL/TLS HTTPS with a certificate signed by a Certificate Authority (CA)": https://www.ptc.com/en/support/article/CS231610
- "Configuring ThingWorx Platform to use SSL/TLS HTTPS with a Self-Signed Certificate": https://www.ptc.com/en/support/article/CS193947

