Revert "remove external libraries from main branch"protocol-modeling

This reverts commit 0558244645611f314f47e0fa427f7323ce253eaf.

1 files changed, 19 insertions, 0 deletions

diff --git a/include/lib/ArduinoJson/Polyfills/isInteger.hpp b/include/lib/ArduinoJson/Polyfills/isInteger.hpp
new file mode 100644
index 0000000..8049079
--- /dev/null
+++ b/include/lib/ArduinoJson/Polyfills/isInteger.hpp
@@ -0,0 +1,19 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#pragma once
+
+#include "./ctype.hpp"
+
+namespace ArduinoJson {
+namespace Internals {
+
+inline bool isInteger(const char* s) {
+  if (!s || !*s) return false;
+  if (issign(*s)) s++;
+  while (isdigit(*s)) s++;
+  return *s == '\0';
+}
+}  // namespace Internals
+}  // namespace ArduinoJson