Is it possible to communicate between a host MCU and ESP12-E via UART using hardware flow control and AT+Commands ?
If so, do you have some connection diagram for GPIO RTS/CTS connection and software setup ?
As for the GPIOs, when flow control is enabled:
GPIO12 = U0DTR
GPIO13 = U0CTS
GPIO14 = U0DSR
GPIO15 = U0RTS
I looked for the flow control in AT Commands sheet. I have only found "AT+UART" command, which allow flow control:
<flow control>: flow control
‣ 0: flow control is not enabled
‣ 1: enable RTS
‣ 2: enable CTS
‣ 3: enable both RTS and CTS
But what about DTR (Data Terminal Ready) - GPIO12 and DSR (Data Set Ready) GPIO14 ? Are these sognals also included when I enable only RTS and CTS ?
I'd suggest allowing the UART flow from ESP->host always when the host can process data.
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