1 | /*
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2 | * Udp.cpp: Library to send/receive UDP packets with the Arduino ethernet shield.
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3 | * This version only offers minimal wrapping of socket.c/socket.h
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4 | * Drop Udp.h/.cpp into the Ethernet library directory at hardware/libraries/Ethernet/
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5 | *
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6 | * MIT License:
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7 | * Copyright (c) 2008 Bjoern Hartmann
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8 | * Permission is hereby granted, free of charge, to any person obtaining a copy
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9 | * of this software and associated documentation files (the "Software"), to deal
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10 | * in the Software without restriction, including without limitation the rights
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11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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12 | * copies of the Software, and to permit persons to whom the Software is
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13 | * furnished to do so, subject to the following conditions:
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14 | *
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15 | * The above copyright notice and this permission notice shall be included in
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16 | * all copies or substantial portions of the Software.
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17 | *
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18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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24 | * THE SOFTWARE.
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25 | *
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26 | * bjoern@cs.stanford.edu 12/30/2008
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27 | *
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28 | * - 10 Apr. 2015
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29 | * Added support for Arduino Ethernet Shield 2
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30 | * by Arduino.org team
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31 | */
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32 |
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33 | #include "utility/w5500.h"
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34 | #include "utility/socket.h"
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35 | #include "Ethernet2.h"
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36 | #include "Udp.h"
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37 | #include "Dns.h"
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38 |
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39 | /* Constructor */
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40 | EthernetUDP::EthernetUDP() : _sock(MAX_SOCK_NUM) {}
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41 |
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42 | /* Start EthernetUDP socket, listening at local port PORT */
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43 | uint8_t EthernetUDP::begin(uint16_t port) {
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44 | if (_sock != MAX_SOCK_NUM)
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45 | return 0;
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46 |
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47 | for (int i = 0; i < MAX_SOCK_NUM; i++) {
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48 | uint8_t s = w5500.readSnSR(i);
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49 | if (s == SnSR::CLOSED || s == SnSR::FIN_WAIT) {
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50 | _sock = i;
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51 | break;
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52 | }
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53 | }
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54 |
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55 | if (_sock == MAX_SOCK_NUM)
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56 | return 0;
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57 |
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58 | _port = port;
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59 | _remaining = 0;
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60 | socket(_sock, SnMR::UDP, _port, 0);
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61 |
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62 | return 1;
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63 | }
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64 |
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65 | /* return number of bytes available in the current packet,
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66 | will return zero if parsePacket hasn't been called yet */
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67 | int EthernetUDP::available() {
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68 | return _remaining;
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69 | }
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70 |
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71 | /* Release any resources being used by this EthernetUDP instance */
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72 | void EthernetUDP::stop()
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73 | {
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74 | if (_sock == MAX_SOCK_NUM)
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75 | return;
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76 |
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77 | close(_sock);
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78 |
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79 | EthernetClass::_server_port[_sock] = 0;
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80 | _sock = MAX_SOCK_NUM;
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81 | }
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82 |
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83 | int EthernetUDP::beginPacket(const char *host, uint16_t port)
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84 | {
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85 | // Look up the host first
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86 | int ret = 0;
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87 | DNSClient dns;
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88 | IPAddress remote_addr;
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89 |
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90 | dns.begin(Ethernet.dnsServerIP());
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91 | ret = dns.getHostByName(host, remote_addr);
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92 | if (ret == 1) {
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93 | return beginPacket(remote_addr, port);
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94 | } else {
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95 | return ret;
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96 | }
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97 | }
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98 |
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99 | int EthernetUDP::beginPacket(IPAddress ip, uint16_t port)
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100 | {
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101 | _offset = 0;
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102 | return startUDP(_sock, rawIPAddress(ip), port);
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103 | }
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104 |
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105 | int EthernetUDP::endPacket()
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106 | {
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107 | return sendUDP(_sock);
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108 | }
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109 |
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110 | size_t EthernetUDP::write(uint8_t byte)
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111 | {
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112 | return write(&byte, 1);
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113 | }
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114 |
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115 | size_t EthernetUDP::write(const uint8_t *buffer, size_t size)
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116 | {
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117 | uint16_t bytes_written = bufferData(_sock, _offset, buffer, size);
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118 | _offset += bytes_written;
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119 | return bytes_written;
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120 | }
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121 |
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122 | int EthernetUDP::parsePacket()
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123 | {
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124 | // discard any remaining bytes in the last packet
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125 | flush();
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126 |
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127 | if (w5500.getRXReceivedSize(_sock) > 0)
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128 | {
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129 | //HACK - hand-parse the UDP packet using TCP recv method
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130 | uint8_t tmpBuf[8];
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131 | int ret =0;
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132 | //read 8 header bytes and get IP and port from it
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133 | ret = recv(_sock,tmpBuf,8);
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134 | if (ret > 0)
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135 | {
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136 | _remoteIP = tmpBuf;
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137 | _remotePort = tmpBuf[4];
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138 | _remotePort = (_remotePort << 8) + tmpBuf[5];
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139 | _remaining = tmpBuf[6];
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140 | _remaining = (_remaining << 8) + tmpBuf[7];
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141 |
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142 | // When we get here, any remaining bytes are the data
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143 | ret = _remaining;
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144 | }
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145 | return ret;
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146 | }
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147 | // There aren't any packets available
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148 | return 0;
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149 | }
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150 |
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151 | int EthernetUDP::read()
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152 | {
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153 | uint8_t byte;
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154 |
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155 | if ((_remaining > 0) && (recv(_sock, &byte, 1) > 0))
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156 | {
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157 | // We read things without any problems
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158 | _remaining--;
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159 | return byte;
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160 | }
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161 |
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162 | // If we get here, there's no data available
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163 | return -1;
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164 | }
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165 |
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166 | int EthernetUDP::read(unsigned char* buffer, size_t len)
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167 | {
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168 |
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169 | if (_remaining > 0)
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170 | {
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171 |
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172 | int got;
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173 |
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174 | if (_remaining <= len)
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175 | {
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176 | // data should fit in the buffer
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177 | got = recv(_sock, buffer, _remaining);
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178 | }
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179 | else
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180 | {
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181 | // too much data for the buffer,
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182 | // grab as much as will fit
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183 | got = recv(_sock, buffer, len);
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184 | }
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185 |
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186 | if (got > 0)
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187 | {
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188 | _remaining -= got;
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189 | return got;
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190 | }
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191 |
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192 | }
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193 |
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194 | // If we get here, there's no data available or recv failed
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195 | return -1;
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196 |
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197 | }
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198 |
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199 | int EthernetUDP::peek()
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200 | {
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201 | uint8_t b;
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202 | // Unlike recv, peek doesn't check to see if there's any data available, so we must.
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203 | // If the user hasn't called parsePacket yet then return nothing otherwise they
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204 | // may get the UDP header
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205 | if (!_remaining)
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206 | return -1;
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207 | ::peek(_sock, &b);
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208 | return b;
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209 | }
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210 |
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211 | void EthernetUDP::flush()
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212 | {
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213 | // could this fail (loop endlessly) if _remaining > 0 and recv in read fails?
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214 | // should only occur if recv fails after telling us the data is there, lets
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215 | // hope the w5500 always behaves :)
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216 |
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217 | while (_remaining)
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218 | {
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219 | read();
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220 | }
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221 | }
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222 |
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