This might be something for makefaire tokyo 2020..
------ ------- -------
| RJ45 | | usb-c | | usb-c |
------ ------- -------
| | |
| ---------- --------
| | upstream | | IP2721 |
| | | --------
| | USB2517 |
| | | --------
| | port1 |--| ch340e |-----\
| | | -------- |
| | port2 |--| ch340e |-----|---------\
| | | -------- | |
| | port3 |--| ch340e |-----|---------|---------\
| | | -------- | | |
| | port4 |--| ch340e |-----|---------|---------|---------\
| | | -------- | | | |
| | port5 |--| ch340e |-----|---------|---------|---------|---------\
| | | -------- | | | | |
| | port6 |--| ch340e |-----|---------|---------|---------|---------|---------\
| | | -------- | | | | | |
| | port7 |--| ch340e |-----|---------|---------|---------|---------|---------|----------\
| --------- -------- | | | | | | |
| | | | | | | |
------------ | | | | | | |
| port 0 | | | | | | | |
| | | | | | | | |
| RTL8309N | | | | | | | |
| | --------- | | | | | |
| port1 |--------------------| drone 1 | | | | | | |
| | --------- --------- | | | | |
| port2 |------------------------------| drone 2 | | | | | |
| | --------- --------- | | | |
| port3 |----------------------------------------| drone 3 | | | | |
| | --------- --------- | | |
| port4 |--------------------------------------------------| drone 4 | | | |
| | --------- --------- | |
| port5 |------------------------------------------------------------| drone 5 | | |
| | --------- --------- |
| port6 |----------------------------------------------------------------------| drone 6 | |
| | --------- ------------
| port7 |--------------------------------------------------------------------------------| Supervisor |
------------ ------------