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J. Nick Koston
6af723e87d
Enable instant wake on socket activity for RP2040 using ARM WFE/SEV hardware instructions, matching ESP8266's esp_delay/esp_schedule pattern. Previously, RP2040 used plain delay() in the main loop which could not be interrupted by incoming socket data. Now LWIP recv/accept callbacks call socket_wake() which sets a flag and sends a hardware event (__sev) to wake the main loop from __wfe() sleep immediately. The implementation uses a one-shot pico-sdk timer alarm for timeout (same pattern as ESP8266's os_timer_arm) combined with __wfe() for true hardware sleep between events.
