diff --git a/net/adc_netproto.h b/net/adc_netproto.h
index 6f70f09..8fa5d9f 100644
--- a/net/adc_netproto.h
+++ b/net/adc_netproto.h
@@ -1 +1,115 @@
 #pragma once
+
+#include "../common/adc_traits.h"
+
+namespace adc
+{
+
+namespace traits
+{
+
+template <typename T, typename R>
+concept adc_netproto_c = adc_range_of_view_char_range<R> && requires(T t, const R& r) {
+    { t.toLowLevel(r) } -> std::same_as<R>;
+    { t.fromLowLevel(r) } -> std::same_as<R>;
+};
+
+}  // namespace traits
+
+
+namespace constants
+{
+
+static constexpr char ADC_DEFAULT_NETPROTO_STOPSEQ[] = "\n";
+
+}  // namespace constants
+
+
+template <typename InetT, const char* STOPSEQ = constants::ADC_DEFAULT_NETPROTO_STOPSEQ>
+struct AdcNetProtoStopSeq : InetT {
+    static constexpr std::string_view stopSeq = STOPSEQ;
+    static constexpr size_t stopSeqSize = stopSeq.size();
+
+    using typename InetT::socket;
+
+    /*  range of char range's views  */
+
+    template <traits::adc_range_of_view_char_range R>
+    R toLowLevel(const R& r)
+    {
+        R res = r;
+
+        // just add to the back of the range "stop sequence" element
+        std::back_inserter(res) = {stopSeq.begin(), stopSeq.end()};
+
+        return res;
+    }
+
+
+    template <traits::adc_range_of_view_char_range R>
+    R fromLowLevel(const R& r)
+    {
+        R res;
+
+        auto N = std::distance(r.begin(), r.end());
+
+        if (!N) {
+            return res;
+        }
+
+        // just remove the last element (it is assumed the last element is the stop sequence)
+        std::ranges::copy(r | std::views::take(N - 1), std::back_inserter(res));
+
+        return res;
+    }
+
+
+    /*  range of char  */
+
+    template <traits::adc_output_char_range R>
+    R toLowLevel(const R& r)
+    {
+        R res = r;
+
+        // just add to the back of the "stop sequence"
+        std::ranges::copy(stopSeq, std::back_inserter(res));
+
+        return res;
+    }
+
+
+    template <traits::adc_output_char_range R>
+    R fromLowLevel(const R& r)
+    {
+        R res;
+
+        auto N = std::distance(r.begin(), r.end());
+
+        if (N <= stopSeq) {  // !!!!!!!!!!!
+            return res;
+        }
+
+        // remove stopSeqSize bytes from the back of the input range
+        std::ranges::copy(r | std::views::take(N - stopSeqSize), std::back_inserter(res));
+
+        return res;
+    }
+
+
+    /*  from iterators to the input range  */
+
+    template <std::input_iterator IT>
+    std::pair<IT, IT> fromLowLevel(IT begin, IT end)
+    {
+        auto N = std::distance(begin, end);
+        if (N <= stopSeqSize) {  // !!!!!!!!
+            return std::make_pair(end, end);
+        }
+
+        std::advance(end, -stopSeqSize);
+
+        return std::make_pair(begin, end);
+    }
+};
+
+}  // namespace adc