How I can connect two esp32 devices with the blueetoth?
yes you can using one is setup as peripheral and the other one is central
There are libraries (documentation) of Zerynth’s ble?
As Michal stated, to establish Bluetooth connection between two boards, you need a peripheral role device (Normally this role sends the sensor data )and central role device.
Currently, Zerynth only supports peripheral roles.
Have a look at the docs: https://docs.zerynth.com/latest/reference/libs/espressif/esp32ble/docs/#espressif-esp32-ble
Let me know if you have more questions.