The new toolchain (2.5.0-2) used from core 2.5.0 does not want bitwise operations to be performed on non-integer variables so we cast the double used in send_2byte_float() to a (long) as it should be.
Updated esp-knx-ip library with a merged version that allows to select multicast library to use:
* WIFI UDP (for esp lib 2.3.0 and up)
* AsyncUDP (for esp lib 2.4.0 and up)
The selection can be done with a definition key in the file esp-knx-ip.h