ESP8266 Wiring Questions

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Gordon
Hi, I'm looking at ways to connect an ESP8266 (ESP12) to an STM32 that leave maximum free pins available, and was wondering if anyone knew:
- GPIO0 puts the ESP8266 into bootloader mode - but does the ESP8266 care what GPIO0 is set to at any point apart from right after reset or power on?
- Does GPIO2 need pulling up, or can it be left disconnected? If it does, does it absolutely need a resistor? I'd be using the AT command firmware so hopefully the code won't be pulling it down.
- What does GPIO16 do on the ESP12? I've seen it pulled up to 3.3v with a resistor, but is that required or can it just be shorted?
- Anything else that's needed for an ESP12?

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