TMUX1109: Looking for UART-Muxer (with some intelligence..?)

Hi,

designing an embedded Linux system with a of-the-shelf Linux module, we face lack of UART connections.

We need to communicate at 9600 baud with

- RF MCU

- BLE module

- Debug

- another RF module

Having only 2 UARTs, it's going to be tough. I can't imagine just using a direct analog/digital muxer, as I don't know (from the host side) when a device raises a request.

So ideally I could think of a device with some internal logic: serving the UART-connections, receiving data and raise an interrupt if there is something received that needs attention. And no, I don't want to program a dedicated MCU for that purpose.

Do I think to complicate or is there anything reeady-to-use available?

Thanks!