If user presses button for 3 secs, discard all lora settings

main/main.ino

@@ -127,6 +127,8 @@ void doDeepSleep(uint64_t msecToWake)
 void sleep() {
 #if SLEEP_BETWEEN_MESSAGES
 
+  // If the user has a screen, tell them we are about to sleep
+  if(ssd1306_found) {
     // Show the going to sleep message on the screen
     char buffer[20];
     snprintf(buffer, sizeof(buffer), "Sleeping in %3.1fs\n", (MESSAGE_TO_SLEEP_DELAY / 1000.0));
@@ -137,6 +139,7 @@ void sleep() {
 
     // Turn off screen
     screen_off();
+    }
 
   // Set the user button to wake the board
   sleep_interrupt(BUTTON_PIN, LOW);
@@ -368,6 +371,27 @@ void loop() {
     sleep();
   }
 
+  // if user presses button for more than 3 secs, discard our network prefs and reboot (FIXME, use a debounce lib instead of this boilerplate)
+  static bool wasPressed = false;
+  static uint32_t minPressMs; // what tick should we call this press long enough
+  if(!digitalRead(BUTTON_PIN)) {
+    if(!wasPressed) { // just started a new press
+      Serial.println("pressing");
+      wasPressed = true;
+      minPressMs = millis() + 3000;
+    } 
+  } else if(wasPressed) {
+    // we just did a release
+    wasPressed = false;
+    if(millis() > minPressMs) {
+      // held long enough
+      screen_print("Erasing prefs");
+      ttn_erase_prefs();
+      delay(5000); // Give some time to read the screen
+      ESP.restart();
+    }
+  }
+
   // Send every SEND_INTERVAL millis
   static uint32_t last = 0;
   static bool first = true;

main/ttn.ino

@@ -386,6 +386,15 @@ static void ttn_set_cnt() {
     }
 }
 
+/// Blow away our prefs (i.e. to rejoin from scratch)
+void ttn_erase_prefs() {
+    Preferences p;
+    if(p.begin("lora", false)) {
+        p.clear();
+        p.end();
+    }
+}
+
 void ttn_send(uint8_t * data, uint8_t data_size, uint8_t port, bool confirmed){
     ttn_set_cnt(); // we are about to send using the current packet count