WebServer.handleClient delay (espressif#4350)

* If WebServer.handleClient is run in a tight loop, it will starve other processes. So, if there is no connection, throw in a delay(1). Fixes espressif#4348 * Made a variable to control the delay behavior

Author: lbernstone

libraries/WebServer/src/WebServer.cpp

@@ -45,6 +45,7 @@ WebServer::WebServer(IPAddress addr, int port)
 , _currentVersion(0)
 , _currentStatus(HC_NONE)
 , _statusChange(0)
+, _nullDelay(true)
 , _currentHandler(nullptr)
 , _firstHandler(nullptr)
 , _lastHandler(nullptr)
@@ -66,6 +67,7 @@ WebServer::WebServer(int port)
 , _currentVersion(0)
 , _currentStatus(HC_NONE)
 , _statusChange(0)
+, _nullDelay(true)
 , _currentHandler(nullptr)
 , _firstHandler(nullptr)
 , _lastHandler(nullptr)
@@ -280,6 +282,9 @@ void WebServer::handleClient() {
  if (_currentStatus == HC_NONE) {
  WiFiClient client = _server.available();
  if (!client) {
+ if (_nullDelay) {
+ delay(1);
+ }
  return;
  }
 
@@ -370,6 +375,10 @@ void WebServer::setContentLength(const size_t contentLength) {
  _contentLength = contentLength;
 }
 
+void WebServer::enableDelay(boolean value) {
+ _nullDelay = value;
+}
+
 void WebServer::enableCORS(boolean value) {
  _corsEnabled = value;
 }

libraries/WebServer/src/WebServer.h

@@ -123,6 +123,7 @@ class WebServer
  void send_P(int code, PGM_P content_type, PGM_P content);
  void send_P(int code, PGM_P content_type, PGM_P content, size_t contentLength);
 
+ void enableDelay(boolean value);
  void enableCORS(boolean value = true);
  void enableCrossOrigin(boolean value = true);
 
@@ -176,6 +177,7 @@ class WebServer
  uint8_t _currentVersion;
  HTTPClientStatus _currentStatus;
  unsigned long _statusChange;
+ boolean _nullDelay;
 
  RequestHandler* _currentHandler;
  RequestHandler* _firstHandler;