In reply to my thread regarding to using 2 UARTs on TLSR8253, @hk.wang suggested using the tlsr9 series which support 2 UARTs.

I had a look at the Datasheet of TLSR9218 and it looks good. But the problem is, that TLSR9x chips or any development boards/dongles with these chips are not available anywhere.

I had a look on Mouser website, who are the distributor of Telink products, but they don't have any TLSR9x products.

I did a Google search and couldn't find those chips anywhere!