in Sources/AwsIotDeviceSdkSwift/mqtt5ClientBuilder.swift [96:101]
init(pkcs12Path: String, pkcs12Password: String, endpoint: String) throws {
_tlsOptions = try TLSContextOptions.makeMTLS(
pkcs12Path: pkcs12Path, password: pkcs12Password)
_endpoint = endpoint
_port = 8883
}