Hi @lilianmartin
Someone has already mentioned this on the OpenThread project BR stay as a child, so the Thread Network can't reach internet · openthread · Discussion #11767 · GitHub. The esp-thread-br version is too old, and we are planning to update it. If you are interested in DIY firmware, you can update the open-source firmware yourself. GitHub - gl-inet/gl-esp-thread-br: Fork Espressif Thread Border Router SDK for GL-S20