Empty init impl

Signed-off-by: Sara Damiano <sdamiano@stroudcenter.org>

src/TinyGsmCommon.h

@@ -80,6 +80,9 @@ static void DBG(Args... args) {
 #define DBG(...)
 #endif
 
+/*
+ * Min/Max Helpers
+ */
 template <class T>
 const T& TinyGsmMin(const T& a, const T& b) {
   return (b < a) ? b : a;

src/TinyGsmModem.tpp

@@ -330,6 +330,8 @@ class TinyGsmModem {
    * Basic functions
    */
  protected:
+  bool initImpl() TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
   bool setBaudImpl(uint32_t baud) {
     thisModem().sendAT(GF("+IPR="), baud);
     return thisModem().waitResponse() == 1;
@@ -344,7 +346,6 @@ class TinyGsmModem {
     return false;
   }
 
-
   // TODO(vshymanskyy): Optimize this!
   int8_t waitResponseImpl(uint32_t timeout_ms, String& data,
                           GsmConstStr r1 = GFP(GSM_OK),