From 5e18cd11719c6c3a535c446a1df3ddd0127ed8b9 Mon Sep 17 00:00:00 2001
From: geeksville <kevinh@geeksville.com>
Date: Sat, 1 Feb 2020 06:14:49 -0800
Subject: [PATCH] If user presses button for 3 secs, discard all lora settings

---
 main/main.ino | 40 ++++++++++++++++++++++++++++++++--------
 main/ttn.ino  |  9 +++++++++
 2 files changed, 41 insertions(+), 8 deletions(-)

diff --git a/main/main.ino b/main/main.ino
index 40b54a9..63654a2 100644
--- a/main/main.ino
+++ b/main/main.ino
@@ -127,16 +127,19 @@ void doDeepSleep(uint64_t msecToWake)
 void sleep() {
 #if SLEEP_BETWEEN_MESSAGES
 
-  // 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));
-  screen_print(buffer);
+  // 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));
+    screen_print(buffer);
 
-  // Wait for MESSAGE_TO_SLEEP_DELAY millis to sleep
-  delay(MESSAGE_TO_SLEEP_DELAY);
+    // Wait for MESSAGE_TO_SLEEP_DELAY millis to sleep
+    delay(MESSAGE_TO_SLEEP_DELAY);
 
-  // Turn off screen
-  screen_off();
+    // 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;
diff --git a/main/ttn.ino b/main/ttn.ino
index b047df8..b760e1d 100644
--- a/main/ttn.ino
+++ b/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