Using two serial bridges on ESP32

[patrmis]

I have a NodeMCU-32 ESP32 device which I want to connect to two separate devices each communicating via Serial.

According to greasyguide:

The ESP32 has three UART controllers, with the following default pins:
UART0: GPIO 1 (TX), GPIO 3 (RX)
UART1: GPIO 10 (TX), GPIO 9 (RX)
UART2: GPIO 17 (TX), GPIO 16 (RX)
But the hardware serial should be able to be used on any GPIO.

I have compiled Tasmota 14.6.0 using TasmoCompiler with (just in case):
#ifndef USE_SERIAL_BRIDGE
#define USE_SERIAL_BRIDGE
#endif

And configured my module as per:

Apparently the hardware serial on GPIO1 & GPIO3 does not need configuring.

Both Serialconfig and SSerialConfig are set to 8N1.
Both Baudrate and SBaudrate is set to 9600.
SSerialBuffer is set to 256, however SerialBuffer responds with {"SerialBuffer":"Done"}, and no amount of coaxing it will change this.

To test the setup I have connected the pins 1&3 to a USB Serial adapter and separately pins 16&17 to a second USB serial adapter.

When I SerialSend5 a0 the PC receives <0xa0>' as expected on adapter 1. Similarly with SSerialSend5 a0the PC receives<0xa0>' on adapter 2.

Now this is where it gets funky, if I respond from the PC with anything, sometimes the software serial (SSerialReceived) will report the receipt of the message, but the hardware serial will not read anything. Other times (not quite sure what the conditions are), the hardware serial (SerialReceived) will read but in those cases the software serial will not.
i.e. the SerialSend and SSerialSend will both work constently, but the SSerialReceived and SerialReceived will only ever read on one or the other.

According to #22431, ESP32 do not have a software serial. Which all the better, as I'd like to use 2 hardware serial. But the SSerialSend command seems to work quite reliably.

Can I, And if so, how do I, correctly set up two simultaneous serial bridges? That can both send and receive.

[patrmis]

I think I may have just stumbled upon a partial answer.

According to #23128:

• can have multiple serial ports using Berry
• can use most any GPIO for a serial port in Berry

But they don't provide a source/url to that statement.
Where would I find the Berry documentation in regards to Serial communication?

[patrmis]

And a fully completed example in #23152.
So I shall go and try Berry myself.

Good Chat! (Even though I've been talking to myself, I'll leave the discussion up, in case it helps someone in the future)