Add mistakingly omitted files

src/c/gentlewake.c

@@ -0,0 +1,30 @@
+// lol the code in this file is mostly stolen from https://github.com/SeaPea/GentleWake
+
+#include <pebble.h>
+
+// A slightly more robust wakeup scheduler that retries on certain errors and
+// can retry for a different wakeup time offset by retry_diff up to retry_max times
+WakeupId wakeup_schedule_simple_robust(time_t wakeup_time, int8_t retry_diff, bool is_fallback) {
+	WakeupId result = 0;
+	uint8_t try_count = 0;
+
+	result = wakeup_schedule(wakeup_time, is_fallback, true);
+
+	if (result < 0) {
+		// If result is negative, something went wrong, so make sure all wakeups for this app are cancelled and try again
+		wakeup_cancel_all();
+
+		result = wakeup_schedule(wakeup_time, is_fallback, true);
+
+		if (result == E_RANGE) {
+			// E_RANGE means some other app has the same wakeup time +/- 1 minute, so try to set
+			// the wakeup for a time up to (retry_diff * 5) minutes before/after.
+			while (result == E_RANGE && try_count++ < 5) {
+				wakeup_time += retry_diff;
+				result = wakeup_schedule(wakeup_time, is_fallback, true);
+			}
+		}
+	}
+
+	return result;
+}

src/c/gentlewake.h

@@ -0,0 +1,4 @@
+#pragma once
+#include <pebble.h>
+
+WakeupId wakeup_schedule_simple_robust(time_t wakeup_time, int8_t retry_diff, bool is_fallback);