ring indicator pin URC test app

user/tests/app/ring_urc/ring_urc.cpp

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+/**
+ ******************************************************************************
+  Copyright (c) 2015 Particle Industries, Inc.  All rights reserved.
+
+  This program is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation, either
+  version 3 of the License, or (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ ******************************************************************************
+ */
+
+// Compile from firmware/modules $ with
+// make clean all PLATFORM_ID=10 -s TEST=app/ring_urc COMPILE_LTO=n DEBUG_BUILD=y program-dfu
+//
+// System will sleep approximately 1 minute after initially connecting to the cloud.
+// Force a URC by grabbing the antenna and reducing signal strength to wake up the system.
+
+#include "application.h"
+
+// ALL_LEVEL, TRACE_LEVEL, DEBUG_LEVEL, WARN_LEVEL, ERROR_LEVEL, PANIC_LEVEL, NO_LOG_LEVEL
+SerialDebugOutput debugOutput(9600, ALL_LEVEL);
+
+uint32_t startTime = 0;
+#define now millis()
+
+SYSTEM_MODE(SEMI_AUTOMATIC);
+
+void setup()
+{
+  delay(4000);
+
+	DEBUG_D("Hello from the Electron! Boot time is: %10.3f\r\n ms", millis()*0.001);
+
+	Particle.connect(); // blocking call to connect
+  startTime = now;
+}
+
+void loop()
+{
+	if (now - startTime > 60000UL) {
+    DEBUG_D("Going to sleep now! Time: %10.3f\r\n", millis()*0.001);
+    delay(100);
+    System.sleep(RI_UC, FALLING);
+    // System consumes about 18mA while STM32 in stop mode and modem still powered on but idle.
+    delay(100);
+    DEBUG_D("Awake again! Time: %10.3f\r\n", millis()*0.001);
+    startTime = now;
+  }
+}