ESP32 OTA, I'm confused

Hello Mr. Ivan,

I watched the video about JFrog Bintray and tried to make it work here. Follow the steps that I did:

  1. Created an account on Bintray

  2. Created a repository called WStation

  3. Created a package called bintray-secure-ota

  4. Cloned your sample code

  5. Changed platformio.ini to:
    [bintray]
    user =
    repository = WStation
    package = bintray-secure-ota
    api_token =

    [wifi]
    ssid =
    password =

    release_version = 1

  6. When env_default (in platformio.ini) is set to release, it uploads the code to bintray. It is working. When I set the env_default to debug and uploaded the firmware to the ESP32, the terminal shows the following log:
    Device version: v.0
    Connecting to … connected!
    IP address: 192.168.100.126
    [E][ssl_client.cpp:33] handle_error(): X509 - Certificate verification failed, e.g. CRL, CA or signature check failed
    [E][ssl_client.cpp:35] handle_error(): MbedTLS message code: -9984
    [E][WiFiClientSecure.cpp:109] connect(): start_ssl_client: -9984
    GET request failed, error, connection refused
    Error: Could not parse JSON!
    Could not load info about the latest firmware, so nothing to update. Continue …

What did I miss?