Add TLV8 add() methods for uint64_t and char*, as well as new getVal() template for returning an integer

src/TLV8.cpp

@@ -81,6 +81,7 @@ TLV8_it TLV8::add(uint8_t tag, size_t len, const uint8_t* val){
 /////////////////////////////////////
 
 TLV8_it TLV8::add(uint8_t tag, TLV8 &subTLV){
+  
   auto it=add(tag,subTLV.pack_size(),NULL);      // create space for inserting sub TLV and store iterator to new element
   subTLV.pack(*it);                              // pack subTLV into new element
   return(--end());
@@ -88,6 +89,17 @@ TLV8_it TLV8::add(uint8_t tag, TLV8 &subTLV){
 
 /////////////////////////////////////
 
+TLV8_it TLV8::add(uint8_t tag, uint64_t val){
+  
+  uint8_t *p=reinterpret_cast<uint8_t *>(&val);
+  size_t nBytes=sizeof(uint64_t);
+  while(nBytes>1 && p[nBytes-1]==0)               // TLV requires little endian without any trailing zero bytes (i.e. only use what is needed to fully represent the value)
+    nBytes--;
+  return(add(tag, nBytes, p));
+}
+
+/////////////////////////////////////
+
 TLV8_it TLV8::find(uint8_t tag, TLV8_it it1, TLV8_it it2){
 
   auto it=it1;
@@ -247,6 +259,12 @@ void TLV8::print(TLV8_it it1, TLV8_it it2){
     Serial.printf("(%d) ",(*it1).len);
     for(int i=0;i<(*it1).len;i++)
       Serial.printf("%02X",(*it1).val.get()[i]);
+    if((*it1).len==0)
+      Serial.printf(" (null)");
+    else if((*it1).len<=4)
+      Serial.printf(" (%u)",(*it1).getVal());
+    else if((*it1).len<=8)
+      Serial.printf(" (%llu)",(*it1).getVal<uint64_t>());
     Serial.printf("\n");
     it1++;
   }

src/TLV8.h

@@ -47,6 +47,13 @@ struct tlv8_t {
     return(val.get());
   }
 
+  template<class T=uint32_t> T getVal(){
+    T iVal=0;
+    for(int i=0;i<len;i++)
+      iVal|=static_cast<T>(val.get()[i])<<(i*8);
+    return(iVal);
+  }
+  
 };
 
 /////////////////////////////////////
@@ -78,9 +85,10 @@ class TLV8 : public std::list<tlv8_t, Mallocator<tlv8_t>> {
   TLV8(const TLV8_names *names, int nNames) : names{names}, nNames{nNames} {};
 
   TLV8_it add(uint8_t tag, size_t len, const uint8_t *val);
-  TLV8_it add(uint8_t tag, uint8_t val){return(add(tag, 1, &val));}
+  TLV8_it add(uint8_t tag, uint64_t val);
-  TLV8_it add(uint8_t tag){return(add(tag, 0, NULL));}
   TLV8_it add(uint8_t tag, TLV8 &subTLV);
+  TLV8_it add(uint8_t tag){return(add(tag, 0, NULL));}
+  TLV8_it add(uint8_t tag, const char *val){return(add(tag, strlen(val), reinterpret_cast<const uint8_t*>(val)));}
 
   TLV8_it find(uint8_t tag, TLV8_it it1, TLV8_it it2);
   TLV8_it find(uint8_t tag, TLV8_it it1){return(find(tag, it1, end()));}