STM32duinoLoraWan new basic example sending calendar packet

Modifying the basic.ino to format the Tx packet with the current
calendar Date and Time
Get the RTC as an external object initialized in MIX mode

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

examples/Basic/Basic.ino

@@ -2,15 +2,21 @@
  * This is a very basic example that demonstrates how to configure the
  * library, join the network, send regular packets and print any
  * downlink packets received.
+ * This example is using the RTC in MIX (binary and BCD) mode
  *
  * Revised BSD License - https://spdx.org/licenses/BSD-3-Clause.html
  */
+#include <STM32RTC.h>
 #include <STM32LoRaWAN.h>
 
 STM32LoRaWAN modem;
 
 static const unsigned long TX_INTERVAL = 60000; /* ms */
 unsigned long last_tx = 0;
+uint8_t payload[27]; /* packet to be sent */
+
+/* Get the rtc object */
+extern STM32RTC& rtc;
 
 void setup()
 {
@@ -29,11 +35,20 @@ void setup()
     Serial.println("Join failed");
     while (true) /* infinite loop */;
   }
+
+  /* set the calendar */
+  rtc.setTime(15, 30, 58);
+  rtc.setDate(04, 07, 23);
+
 }
 
 void send_packet()
 {
-  uint8_t payload[] = {0xde, 0xad, 0xbe, 0xef};
+  /* prepare the Tx packet : get date and format string */
+  sprintf((char *)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, sizeof(payload));