This post by Peter Scargill may prove useful to makers looking to free up programming space in their ESP8266 designs.
What you see above – the left 2 columns represent the very original code I used with TuanPM’s MQTT as the base. In the middle one I’d moved non-volatile storage up to the top of available FLASH space (which applies to most of the current crop of boards from ESP-01 upwards) and moved the start of code all the way down to 0x10000 giving a massive amount of room for development – unlike the original case where I was running out.
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