Add LwIP 2 no features (Low Flash)

[Jason2866]

No description provided.

[ascillato]

@localhost61 I have just updated my last comment to specify that these options depends on which core are you compiling.

[localhost61]

In STAGE core, and maybe others too, I suspect the option -DPIO_FRAMEWORK_ARDUINO_LWIP2_HIGHER_BANDWIDTH_LOW_FLASH to reduce the connection quality.
I upgraded all my devices to 6.4.1.1 with STAGE core and this option, several devices had difficulties to establish a good connection, even with a 70% RSSI signal. I recompiled with -DPIO_FRAMEWORK_ARDUINO_LWIP2_HIGHER_BANDWIDTH and flashed again all of them and now everything is fine, I experiment very few disconnections.