Add WiFiClient.write for Stream

reads directly from the stream and fragments the data to achieve
maximum data throughput over WiFi

Author: ficeto

hardware/esp8266com/esp8266/libraries/ESP8266WiFi/src/WiFiClient.cpp

@@ -138,6 +138,34 @@ size_t ICACHE_FLASH_ATTR WiFiClient::write(const uint8_t *buf, size_t size)
     return _client->write(reinterpret_cast<const char*>(buf), size);
 }
 
+size_t ICACHE_FLASH_ATTR WiFiClient::write(Stream &src)
+{
+    uint8_t obuf[1460];
+    size_t doneLen = 0;
+    size_t sentLen;
+    int i;
+    
+    while (src.available() > 1460)
+    {
+        for(i=0;i<1460;i++) obuf[i] = src.read();
+        sentLen = write(obuf, 1460);
+        doneLen = doneLen + sentLen;
+        if(sentLen != 1460){
+            DEBUGV("Sent: %u < 1460\r\n", sentLen);
+            return doneLen;
+        }
+    }
+      
+    uint16_t leftLen = src.available();
+    for(i=0;i<leftLen;i++) obuf[i] = src.read();
+    sentLen = write(obuf, leftLen);
+    doneLen = doneLen + sentLen;
+    if(sentLen != leftLen){
+        DEBUGV("Sent: %u < %u\r\n", sentLen, leftLen);
+    }
+    return doneLen;
+}
+
 extern "C" uint32_t esp_micros_at_task_start();
 
 int ICACHE_FLASH_ATTR WiFiClient::available()

hardware/esp8266com/esp8266/libraries/ESP8266WiFi/src/WiFiClient.h

@@ -55,6 +55,7 @@ class WiFiClient : public Client {
 
   IPAddress remoteIP();
   uint16_t  remotePort();
+  size_t write(Stream&);
 
   friend class WiFiServer;