Added toHexString()

CMakeLists.txt

@@ -32,6 +32,7 @@ set(dependencies
     esp_system
 #    esp_http_client
     esp_websocket_client
+    libsodium
     tcp_transport
 
     cpputils

src/espstrutils.cpp

@@ -3,8 +3,11 @@
 #include "sdkconfig.h"
 #define LOG_LOCAL_LEVEL CONFIG_ESPCPPUTILS_LOG_LOCAL_LEVEL
 
+#include <assert.h>
+
 // esp-idf includes
 #include <esp_log.h>
+#include <sodium/utils.h>
 
 // 3rdparty lib includes
 #include <fmt/core.h>
@@ -58,4 +61,18 @@ std::string toString(esp_log_level_t val)
     }
 }
 
+std::string toHexString(std::basic_string_view<unsigned char> buf)
+{
+    std::string hex(buf.size() * 2 + 1, {});
+    assert(hex.size() == buf.size() * 2 + 1);
+
+    const char *ptr = sodium_bin2hex(hex.data(), hex.size(), buf.data(), buf.size());
+
+    hex.resize(hex.size() - 1);
+    assert(hex.size() == buf.size() * 2);
+
+    ESP_LOGI(TAG, "sodium=%p end=%p", ptr, &*std::end(hex));
+    return hex;
+}
+
 } // namespace espcpputils

src/espstrutils.h

@@ -2,6 +2,7 @@
 
 // system includes
 #include <string>
+#include <string_view>
 
 // esp-idf includes
 #include <esp_sntp.h>
@@ -13,4 +14,10 @@ std::string toString(sntp_sync_mode_t val);
 std::string toString(sntp_sync_status_t val);
 std::string toString(esp_log_level_t val);
 
+std::string toHexString(std::basic_string_view<unsigned char> buf);
+inline std::string toHexString(std::string_view str)
+{
+    return toHexString(std::basic_string_view<unsigned char>{reinterpret_cast<const unsigned char *>(str.data()), str.size()});
+}
+
 } // namespace espcpputils