Add WiFi to RPI PicoW (and perhaps others) - #3357
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SerialWifiInterface has no ESP32-specific code, so move it to helpers/wifi and reuse it on RP2040. Guard the ESP32-only WiFi event/auto-reconnect calls and poll link state on RP2040 instead. Claude-Session: https://claude.ai/code/session_01MqZruyfb2RkNZorHcBg4P9
Store ssid/pwd in NodePrefs and set them with 'set wifi.ssid' / 'set wifi.pwd' over USB serial; build-time WIFI_SSID/WIFI_PWD stay as the fallback. Headless WiFi builds get the config CLI on Serial, which is otherwise unused there. Claude-Session: https://claude.ai/code/session_01MqZruyfb2RkNZorHcBg4P9
arduino-pico's WiFi.begin() blocks for up to 2x its 15s timeout, which stalled the mesh loop on every reconnect attempt; use beginNoBlock(). Log the IP when the link comes up, and the status code when retrying. Claude-Session: https://claude.ai/code/session_01MqZruyfb2RkNZorHcBg4P9
- scope the serial config CLI to RP2040; it was exposing the rescue CLI (cat/rm/erase) on every ESP32 WiFi build, which gates it behind a physical long-press - bound and space out RP2040 rejoins: the core's join busy-waits, so cap it at 5s and retry every 30s instead of every 10s - stamp the reconnect timer in setup(), so the first loop() doesn't tear down an association that is still finishing DHCP - treat stored credentials as a pair, and pass NULL (not "") for an open network - teach build_as_lib.py where SerialWifiInterface moved Claude-Session: https://claude.ai/code/session_01MqZruyfb2RkNZorHcBg4P9
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Closes #3355
SerialWifiInterface had no ESP32-specific code in it, so I moved it to helpers/wifi and reused it as-is. The RP2040 side needed guards around three ESP32-only calls (setInhibitSleep, onEvent, setAutoReconnect) and polls WiFi.status() instead, since arduino-pico has no event callbacks or reconnect().
Quirks:
Also added runtime WiFi credentials, since a Pico W has no display and no way to reach the rescue CLI. "set wifi.ssid" / "set wifi.pwd" persist to NodePrefs, with the build-time values as fallback. These work on any WiFi build; on RP2040 the config CLI runs on USB serial (nothing else is using it there), elsewhere it's the existing button-triggered rescue CLI.
Tested on a Pico W: joins, gets DHCP, and the companion protocol works over TCP (DEVICE_QUERY and APP_START both answer). Credentials survive a reboot. Also built Heltec V3 wifi/ble/repeater and RAK4631 BLE to check nothing else broke. I have not tested those, however, as I do not own those devices.