Merge remote-tracking branch 'remotes/esp8266/esp8266' into esp8266

libraries/ESP8266WiFi/examples/WiFiTelnetToSerial/WiFiTelnetToSerial.ino

@@ -25,7 +25,7 @@
 const char* ssid = "**********";
 const char* password = "**********";
 
-WiFiServer server(21);
+WiFiServer server(23);
 WiFiClient serverClients[MAX_SRV_CLIENTS];
 
 void setup() {
@@ -45,7 +45,7 @@ void setup() {
   
   Serial1.print("Ready! Use 'telnet ");
   Serial1.print(WiFi.localIP());
-  Serial1.println(" 21' to connect");
+  Serial1.println(" 23' to connect");
 }
 
 void loop() {

libraries/ESP8266WiFi/src/WiFiClient.cpp

@@ -177,20 +177,17 @@ size_t WiFiClient::write(const uint8_t *buf, size_t size)
     return _client->write(reinterpret_cast<const char*>(buf), size);
 }
 
-extern "C" uint32_t esp_micros_at_task_start();
-
 int WiFiClient::available()
 {
-    static uint32_t lastPollTime = 0;
-    if (!_client)
-        return 0;
+    int result = 0;
 
-    if (lastPollTime > esp_micros_at_task_start())
-        yield();
+    if (_client) {
+        result = _client->getSize();
+    }
 
-    lastPollTime = micros();
-
-    int result = _client->getSize();
+    if (!result) {
+        optimistic_yield();
+    }
     return result;
 }
 

libraries/ESP8266WiFi/src/WiFiServer.cpp

@@ -84,8 +84,6 @@ bool WiFiServer::getNoDelay(){
   return tcp_nagle_disabled(_pcb);
 }
 
-extern "C" uint32_t esp_micros_at_task_start();
-
 bool WiFiServer::hasClient(){
   if (_unclaimed) return true;
   return false;
@@ -93,8 +91,6 @@ bool WiFiServer::hasClient(){
 
 WiFiClient WiFiServer::available(byte* status)
 {
-    static uint32_t lastPollTime = 0;
-
     if (_unclaimed)
     {
         WiFiClient result(_unclaimed);
@@ -103,9 +99,7 @@ WiFiClient WiFiServer::available(byte* status)
         return result;
     }
 
-    if (lastPollTime > esp_micros_at_task_start())
-        yield();
-    lastPollTime = micros();
+    optimistic_yield();
 
     return WiFiClient();
 }

libraries/ESP8266WiFi/src/WiFiUdp.cpp

@@ -116,9 +116,17 @@ uint8_t WiFiUDP::beginMulticast(IPAddress interfaceAddr, IPAddress multicast, ui
 /* return number of bytes available in the current packet,
    will return zero if parsePacket hasn't been called yet */
 int WiFiUDP::available() {
-    if (!_ctx)
-        return 0;
-    return static_cast<int>(_ctx->getSize());
+    int result = 0;
+
+    if (_ctx) {
+        result = static_cast<int>(_ctx->getSize());
+    }
+
+    if (!result) {
+        optimistic_yield();
+    }
+
+    return result;
 }
 
 /* Release any resources being used by this WiFiUDP instance */

libraries/Wire/Wire.cpp

@@ -161,7 +161,13 @@ size_t TwoWire::write(const uint8_t *data, size_t quantity){
 }
 
 int TwoWire::available(void){
-  return rxBufferLength - rxBufferIndex;
+    int result = rxBufferLength - rxBufferIndex;
+
+    if (!result) {
+        optimistic_yield();
+    }
+
+    return result;
 }
 
 int TwoWire::read(void){