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On ESP8266, .rodata is mapped to DRAM (RAM), not flash. When StructInitializer is used with all compile-time constant fields, the compiler places the entire struct as a const blob in .rodata, silently consuming ~20 bytes of RAM. Switch to field-by-field assignment on ESP8266 so the IP address values are encoded as immediate operands in flash instructions instead of a .rodata blob. Other platforms continue to use the aggregate initializer since their .rodata is flash-mapped.
