Maximum baud for Serial?

I believe the “standard” Arduino supported rate tops out at 115200. Does the RUI3 implementation (on the RAK4631) allow faster speeds than this? Is it lookup table based or a best effort calculation of clock divider constants?

(I could poke it and try, but I figure it’s more instructive for everyone if I ask the RAK crew)


I don’t know how it is done inside of RUI3, but I know the baud rate is limited to 115200. Even if I try to set it to 230400 with AT+BAUD command, it sticks with 115200.

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