Update LoRa_Device_01.h

Author: Edzelf

src/LoRa_Device_01.h

@@ -22,5 +22,5 @@ uint8_t       NwkSKey[] = { 0x37, 0x84, 0x9B, 0x30, 0x33, 0xEE, 0x5A, 0xD1,
 uint8_t       AppSKey[] = { 0x5C, 0x4E, 0x2A, 0x28, 0x22, 0xBB, 0x93, 0x4E,
                             0x99, 0xA4, 0x19, 0xA9, 0xDA, 0x34, 0x5F, 0x8E } ;
 
-uint32_t      tx_interval_sec = 60 ;                            // Send a message every 60 seconds
+uint32_t      tx_interval_sec = 600 ;                            // Send a message every 600 seconds