added getVDD()

Author: hallard

src/TheThingsNetwork.cpp

@@ -307,6 +307,14 @@ size_t TheThingsNetwork::getHardwareEui(char *buffer, size_t size)
   return readResponse(SYS_TABLE, SYS_TABLE, SYS_GET_HWEUI, buffer, size);
 }
 
+uint16_t TheThingsNetwork::getVDD()
+{
+  if (readResponse(SYS_TABLE, SYS_TABLE, SYS_GET_VDD, buffer, sizeof(buffer)) > 0) {
+    return atoi(buffer);
+  }
+  return 0;
+}
+
 void TheThingsNetwork::debugPrintIndex(uint8_t index, const char *value)
 {
   char message[100];

src/TheThingsNetwork.h

@@ -83,6 +83,7 @@ class TheThingsNetwork
   void showStatus();
   size_t getHardwareEui(char *buffer, size_t size);
   size_t getAppEui(char *buffer, size_t size);
+  uint16_t getVDD();
   void onMessage(void (*cb)(const uint8_t *payload, size_t size, port_t port));
   bool provision(const char *appEui, const char *appKey);
   bool join(const char *appEui, const char *appKey, int8_t retries = -1, uint32_t retryDelay = 10000);