Add IPAddress.h to Client.h

CHANGELOG.md

@@ -30,6 +30,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - `ARDUINO_CI_SKIP_SPLASH_SCREEN_RSPEC_TESTS` no longer affects any tests because there are no longer splash screens since switching to `arduino-cli`
 
 ### Fixed
+- Missing include of `IPAddress.h` in `Client.h`
 - Mismatches between library names in `library.properties` and the directory names, which can cause cryptic failures
 - `LibraryProperties` skips over parse errors instead of crashing: only lines with non-empty keys and non-nil values are recorded
 

SampleProjects/NetworkLib/test/client.cpp

@@ -0,0 +1,7 @@
+#include <ArduinoUnitTests.h>
+// test for including <Client.h> without <Arduino.h>
+#include <Client.h>
+
+unittest(test) { assertTrue(true); }
+
+unittest_main()

cpp/arduino/Client.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <Stream.h>
+#include <IPAddress.h>
 
 class Client : public Stream {
 public: