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GPIO4 and GPIO5 swapped on ESP12, ESP12-SMD and ESP07-16PIN #14
The PIN next to RX on ESP12 (and ESP07) modules is GPIO5. The library is correct on the ESP-12E, but on ESP12, ESP12-SMD and ESP07-16PIN GPIO4 and GPIO5 swapped!
Actually this is a quite common/stupid error, because there exist lots of modules with also wrong silkscreen.