75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
// Demo for using persistence flag and readPacketSlice()
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// http://opensource.org/licenses/mit-license.php
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#include <EtherCard.h>
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// ethernet interface mac address, must be unique on the LAN
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static byte mymac[] = { 0x74,0x69,0x69,0x2D,0x30,0x31 };
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// the buffersize must be relatively large for DHCP to work; when
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// using static setup a buffer size of 100 is sufficient;
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#define BUFFERSIZE 350
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byte Ethernet::buffer[BUFFERSIZE];
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const char website[] PROGMEM = "textfiles.com";
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uint32_t nextSeq;
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// called when the client request is complete
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static void my_callback (byte status, word off, word len) {
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if (strncmp_P((char*) Ethernet::buffer+off,PSTR("HTTP"),4) == 0) {
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Serial.println(">>>");
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// first reply packet
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nextSeq = ether.getSequenceNumber();
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}
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if (nextSeq != ether.getSequenceNumber()) { Serial.print(F("<IGNORE DUPLICATE(?) PACKET>")); return; }
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uint16_t payloadlength = ether.getTcpPayloadLength();
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int16_t chunk_size = BUFFERSIZE-off-1;
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int16_t char_written = 0;
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int16_t char_in_buf = chunk_size < payloadlength ? chunk_size : payloadlength;
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while (char_written < payloadlength) {
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Serial.write((char*) Ethernet::buffer+off,char_in_buf);
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char_written += char_in_buf;
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char_in_buf = ether.readPacketSlice((char*) Ethernet::buffer+off,chunk_size,off+char_written);
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}
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nextSeq += ether.getTcpPayloadLength();
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}
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void setup () {
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Serial.begin(57600);
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Serial.println(F("\n[Persistence+readPacketSlice]"));
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if (ether.begin(sizeof Ethernet::buffer, mymac) == 0)
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Serial.println(F("Failed to access Ethernet controller"));
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if (!ether.dhcpSetup())
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Serial.println(F("DHCP failed"));
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ether.printIp("IP: ", ether.myip);
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ether.printIp("GW: ", ether.gwip);
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ether.printIp("DNS: ", ether.dnsip);
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if (!ether.dnsLookup(website))
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Serial.println("DNS failed");
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ether.printIp("SRV: ", ether.hisip);
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ether.persistTcpConnection(true);
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}
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void loop () {
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ether.packetLoop(ether.packetReceive());
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static uint32_t timer = 0;
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if (millis() > timer) {
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timer = millis() + 7000;
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Serial.println();
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Serial.print("<<< REQ ");
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ether.browseUrl(PSTR("/stories/"), "cmoutmou.txt", website, my_callback);
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}
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}
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