Update docs with new HardwareSerial buffer size

[PhilColbert]

From 2.0.0. to 2.1.0 the TX and RX buffer sizes are gone :(

My code is dealing with GPS input therefore requires a large buffer size to cope.... please put it back ! :)

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[igrr]

Removing the software-managed buffers was intentional (#1496), because otherwise we had issues when Serial was used from tasks other than main arduino task. For your application you can probably poll data at a higher rate. There is also a suggestion to support Arduino serialEvent API (#752).

[PhilColbert]

Thank you for the reply.

Unfortunately I cant poll at a higher rate as the data requires parsing as it comes in and this requires uploading back to a wificlient and to a radio transmitter, this takes some time, in that time the serial buffer fills ...

Sorry I am still new to coding with the esp so might be coding it incorrectly.

I will just have to stick with 2.0.0 for now.

Thank you anyway.

[PhilColbert]

I am receiving around 500 - 1000 bytes / sec... any idea how to deal with this issue in 2.1.0 without the serial buffer issue?

Thanks

[tablatronix]

Does this mean the docs need to change ?

Apart from hardware FIFO (128 bytes for TX and RX) HardwareSerial has additional 256-byte TX and RX buffers

[miky2k]

I suppose that hardaware fifo is still used.