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fix(micropython): route unknown SSIDs to the emulated AP instead of hanging 

Follow-up to the #262 fix. Handing MicroPython the real driver exposed a
population the stub had been quietly carrying: sketches that connect to
an SSID that simply does not exist in the emulated radio. The AP tables
(QEMU esp32_wifi_ap.c and the esp32*js engines — same four networks in
both) associate by MAC/channel, so an unknown SSID scans to nothing and
`while not isconnected():` spins forever. Most 100-days gallery examples
ship their author's home SSID, so "real driver, no shim" would have
frozen them on the connect loop.

So when a NIC is attached the prelude now injects a thin proxy around
the REAL network module: connect() to any SSID outside the emulated set
is redirected to Velxio-GUEST (announced on serial, so nobody debugs a
connection they didn't make); known SSIDs pass through untouched; every
other attribute delegates to the native module. Result: made-up-SSID
sketches get genuine DHCP/DNS/TCP through SLIRP instead of the old fake
answers, and the reporter's PICSimLabWifi repro is never rewritten.

Wrapper semantics (rewrite, passthrough, module-attr delegation, and the
`from network import WLAN` form) are exercised against an instrumented
fake module; both generated preludes are syntax-checked.
This commit is contained in:
David Montero Crespo 2026-08-10 21:52:24 +02:00
parent 0653aad3d4
commit f96d239a1d
1 changed files with 35 additions and 1 deletions
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36
frontend/src/store/useSimulatorStore.ts
View File

@ -2015,7 +2015,41 @@ export const useSimulatorStore = create<SimulatorState>((set, get) => {
// useful data instead of "API Error".
const now = new Date();
const fakeWeatherCity = 'Simulator City';
const networkStub = wifiOn ? [] : [
// With a NIC attached: the REAL driver, behind a thin proxy that
// rewrites unknown SSIDs to the emulated AP. The emulated radio
// (QEMU esp32_wifi_ap.c and the esp32*js engines both) announces
// exactly four networks; a sketch that connects to its author's
// home SSID would scan, find nothing, and busy-wait on
// isconnected() forever — which is what every gallery example
// that ships a made-up SSID would do. Redirecting to
// Velxio-GUEST keeps those sketches on the REAL stack (DHCP on
// 192.168.4.x, DNS, outbound TCP through SLIRP) instead of
// reviving the fake stub for them. Known SSIDs pass through
// untouched, and the rewrite is announced on serial so nobody
// debugs a connection they didn't make.
const networkStub = wifiOn ? [
'import network as _vlx_net',
'_VLX_SSIDS = ("Velxio-GUEST", "PICSimLabWifi", "Espressif", "MasseyWifi")',
'class _VlxWLAN:',
' def __init__(self, *a, **k):',
' self._w = _vlx_net.WLAN(*a, **k)',
' def connect(self, ssid=None, key=None, **kw):',
' if ssid is not None and ssid not in _VLX_SSIDS:',
' print("[velxio] SSID %r is not part of the emulated network; connecting to \'Velxio-GUEST\' instead" % ssid)',
' ssid, key = "Velxio-GUEST", ""',
' if ssid is None:',
' return self._w.connect()',
' return self._w.connect(ssid, key, **kw)',
' def __getattr__(self, n):',
' return getattr(self._w, n)',
'class _VlxNetwork:',
' STA_IF = _vlx_net.STA_IF',
' AP_IF = _vlx_net.AP_IF',
' WLAN = _VlxWLAN',
' def __getattr__(self, n):',
' return getattr(_vlx_net, n)',
'sys.modules["network"] = _VlxNetwork()',
] : [
'class _StubWLAN:',
' def __init__(self, *a, **k):',
' self._calls = 0',