Hello all i had the same problem compiling r78. im using cores 2.2.0 ******\Desktop\arduino\esp8266\ESPEasy_R78\Source\ESPEasy\_P020_Ser2Net.ino: In function 'boolean Plugin_020(byte, EventStruct*, String&)': _P020_Ser2Net:114: error: invalid conversion from 'byte {aka unsigned char}' to 'Serial...