...

net/adc_netproto.h

@@ -34,6 +34,10 @@ struct AdcStopSeqSessionProto {
 
     static_assert(STOP_SEQ_SIZE, "STOP BYTE SEQUENCE MUST NOT BE AN EMPTY ONE!!!");
 
+    typedef std::string proto_ident_t;
+
+    proto_ident_t ident() const { return "STOP SEQUENCE PROTO"; }
+
     template <traits::adc_input_char_range R>
     auto search(const R& r)
     {
@@ -41,7 +45,7 @@ struct AdcStopSeqSessionProto {
 
         std::get<1>(res) = std::search(r.begin(), r.end(), STOP_SEQ.begin(), STOP_SEQ.end());
         if (std::get<1>(res) != r.end()) {  // move iterator to the one-past-the-end position
-            std::get<1>(res) = std::advance(std::get<1>(res), STOP_SEQ_SIZE);
+            std::advance(std::get<1>(res), STOP_SEQ_SIZE);
             std::get<2>(res) = true;
         }
 
@@ -73,7 +77,8 @@ struct AdcStopSeqSessionProto {
         auto N = std::distance(r.begin(), r.end());
 
         if (N < STOP_SEQ_SIZE) {  // one must ensure for input range size correctness
-            return std::span<std::ranges::range_value_t<R>>();
+            // return std::span<std::ranges::range_value_t<R>>();
+            return std::ranges::subrange(r.begin(), r.begin());
         }
 
         if constexpr (std::ranges::viewable_range<R>) {