new sketch using the Lowpower mode with LoraWan connection

examples/LowPowerBasic/LowPowerBasic.ino

@@ -0,0 +1,116 @@
+/*
+ *  LowPowerBasic
+ *
+ * This is a basic example that demonstrates how to configure the
+ * library, join the network, then go to Low Power deep Sleep (STOP mode)
+ * and on WakeUp, send regular packets with current RTC calendar value.
+ * Then It goes to LowPower again for a period (TX_INTERVAL milliseconds)
+ *
+ * This example is using the RTC in MIX (binary and BCD) mode
+ * and the LowPower library
+ *
+ * Revised BSD License - https://spdx.org/licenses/BSD-3-Clause.html
+ */
+#include <STM32LoRaWAN.h>
+#include <STM32LowPower.h>
+#include <STM32RTC.h>
+
+STM32LoRaWAN modem;
+/* Get the rtc object */
+STM32RTC& rtc = STM32RTC::getInstance();
+
+/* Change this value to set alarm match offset in millisecond */
+static const unsigned long TX_INTERVAL = 60000; /* ms */
+
+// Declare it volatile since it's incremented inside an interrupt
+volatile int alarmMatch_counter = 0;
+
+/* callback function once the Alarm A matched */
+void alarmMatch(void* data)
+{
+  UNUSED(data);
+  alarmMatch_counter++;
+}
+
+void background_work()
+{
+  /* Toggle LED */
+  digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
+
+  Serial.print("  Alarm Match: ");
+  Serial.print(alarmMatch_counter);
+  Serial.println(" times. deepSleeping now ! ");
+  Serial.flush(); /* Flush before going to sleep */
+}
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+
+  Serial.begin(115200);
+  Serial.println("Start");
+  modem.begin(EU868);
+
+  // Configure join method by (un)commenting the right method
+  // call, and fill in credentials in that method call.
+
+  bool connected = modem.joinOTAA(/* AppEui */ "0000000000000000", /* AppKey */ "00000000000000000000000000000000", /* DevEui */ "0000000000000000");
+  //bool connected = modem.joinABP(/* DevAddr */ "00000000", /* NwkSKey */ "00000000000000000000000000000000", /* AppSKey */ "00000000000000000000000000000000");
+
+
+  if (connected) {
+    Serial.println("Joined");
+  } else {
+    Serial.println("Join failed");
+    while (true); /* infinite loop */
+  }
+
+  /* set the calendar */
+  rtc.setTime(15, 30, 58);
+  rtc.setDate(4, 9, 23);
+
+  // Configure low power
+  LowPower.begin();
+  LowPower.enableWakeupFrom(&rtc, alarmMatch);
+
+}
+
+void send_packet() {
+  char payload[27] = { 0 }; /* packet to be sent */
+  /* prepare the Tx packet : get date and format string */
+  sprintf(payload, "%02d/%02d/%04d - %02d:%02d:%02d",
+          rtc.getMonth(), rtc.getDay(), 2000 + rtc.getYear(),
+          rtc.getHours(), rtc.getMinutes(), rtc.getSeconds());
+  modem.setPort(10);
+  modem.beginPacket();
+  modem.write(payload, strlen(payload));
+Serial.println(payload);
+  if (modem.endPacket() == (int)strlen(payload)) {
+    Serial.println("Sent packet");
+  } else {
+    Serial.println("Failed to send packet");
+  }
+
+  if (modem.available()) {
+    Serial.print("Received packet on port ");
+    Serial.print(modem.getDownlinkPort());
+    Serial.print(":");
+    while (modem.available()) {
+      uint8_t b = modem.read();
+      Serial.print(" ");
+      Serial.print(b >> 4, HEX);
+      Serial.print(b & 0xF, HEX);
+    }
+    Serial.println();
+  }
+}
+
+void loop()
+{
+
+  background_work();
+
+  LowPower.deepSleep(TX_INTERVAL);
+
+  send_packet();
+
+}