Due to ESP32 limited number of pins the two mikroBUS sockets share some resources. Thus, it is possible to use simultaneously only mikroBUS clicks based on different interfaces (i.e. GSM click based on UART on slot 1 and Weather click based on I2C on slot 2).
This will be well described in the 4zerobox documentation where a detailed pinmap of all the features, connections, ports and components integrated into the 4zerobox will be included.
By the software point of view, various mikroBUS clicks are already supported by Zerynth (see library list here https://www.zerynth.com/zerynth-libraries/). All the drivers and libraries required by the MikroElektronika clicks included in the kits will be developed and released according to the project timeline. Many other click drivers will be published in future by the 4zerobox and Zerynth teams.
Moreover, Zerynth supports publications of libraries developed by community users so we also hope to have click’s libraries developed by our backers and customers in future.