Added utility to generate random strings

esputils.h

@@ -5,8 +5,10 @@
 #include <cstdint>
 #include <functional>
 #include <vector>
+#include <cstring>
 #include <string>
 #include <string_view>
+#include <random>
 
 /*
    Avoid "unused parameter" warnings
@@ -227,5 +229,18 @@ bool is_in(First &&first, T && ... t)
     return ((first == t) || ...);
 }
 
+std::string randomString(std::size_t length)
+{
+    static constexpr auto chars =
+        "0123456789"
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+        "abcdefghijklmnopqrstuvwxyz";
+    thread_local auto rng = std::default_random_engine();
+    auto dist = std::uniform_int_distribution{{}, std::strlen(chars) - 1};
+    auto result = std::string(length, '\0');
+    std::generate_n(std::begin(result), length, [&]() { return chars[dist(rng)]; });
+    return result;
+}
+
 } // namespace
 } // namespace espcpputils