Add station-only WiFi UDP bridge with eight authenticated peers

src/helpers/UDPBridgeSettings.cpp

@@ -0,0 +1,51 @@
+#include "UDPBridgeSettings.h"
+
+#if defined(WITH_UDP_BRIDGE)
+#include "CheckedSettingsFile.h"
+#include "ContactFileTransaction.h"
+#include "FilePresence.h"
+
+namespace mesh { namespace bridge { namespace udp {
+namespace { constexpr char Path[] = "/udp_bridge"; }
+
+bool Settings::begin(FILESYSTEM* fs) {
+  fs_ = fs;
+  prefs_ = Prefs();
+  healthy_ = false;
+  if (!fs_ || !ContactFileTransaction::recover(fs_, Path, filePresence<FILESYSTEM>)) return false;
+  bool present = false;
+  if (!filePresence(fs_, Path, present)) return false;
+  if (!present) { healthy_ = true; return true; }
+  uint8_t image[PREFS_IMAGE_SIZE];
+  const auto read = storage::readFixedSettingsFileResult(fs_, Path, image, sizeof(image));
+  if (read == storage::FixedSettingsRead::Unreadable) return false;
+  healthy_ = true;
+  return read == storage::FixedSettingsRead::Complete
+      && decodePrefs(image, sizeof(image), prefs_);
+}
+
+bool Settings::setPrefs(const Prefs& prefs) {
+  if (!healthy_ || !fs_ || !validPrefs(prefs)) return false;
+  uint8_t image[PREFS_IMAGE_SIZE];
+  encodePrefs(image, prefs);
+  ContactFileTransaction writer(fs_, Path, filePresence<FILESYSTEM>);
+  if (!writer || writer.write(image, sizeof(image)) != sizeof(image)) {
+    if (writer.outcome() == ContactFileTransaction::Outcome::Indeterminate) healthy_ = false;
+    return false;
+  }
+  writer.commit();
+  if (writer.outcome() == ContactFileTransaction::Outcome::NotCommitted) return false;
+  if (writer.outcome() != ContactFileTransaction::Outcome::Committed) {
+    healthy_ = false;
+    return false;
+  }
+  uint8_t verified[PREFS_IMAGE_SIZE];
+  healthy_ = storage::readFixedSettingsFile(fs_, Path, verified, sizeof(verified))
+      && memcmp(image, verified, sizeof(image)) == 0;
+  if (!healthy_) return false;
+  prefs_ = prefs;
+  return true;
+}
+
+}}}  // namespace mesh::bridge::udp
+#endif