1 | /*
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2 | Copyright (c) 2013 Arduino LLC. All right reserved.
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3 |
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4 | This library is free software; you can redistribute it and/or
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5 | modify it under the terms of the GNU Lesser General Public
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6 | License as published by the Free Software Foundation; either
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7 | version 2.1 of the License, or (at your option) any later version.
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8 |
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9 | This library is distributed in the hope that it will be useful,
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10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 | Lesser General Public License for more details.
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13 |
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14 | You should have received a copy of the GNU Lesser General Public
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15 | License along with this library; if not, write to the Free Software
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16 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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17 | */
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18 |
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19 | #include <YunClient.h>
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20 |
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21 | YunClient::YunClient(int _h, BridgeClass &_b) :
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22 | bridge(_b), handle(_h), opened(true), buffered(0) {
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23 | }
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24 |
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25 | YunClient::YunClient(BridgeClass &_b) :
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26 | bridge(_b), handle(0), opened(false), buffered(0) {
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27 | }
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28 |
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29 | YunClient::~YunClient() {
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30 | }
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31 |
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32 | YunClient& YunClient::operator=(const YunClient &_x) {
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33 | opened = _x.opened;
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34 | handle = _x.handle;
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35 | return *this;
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36 | }
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37 |
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38 | void YunClient::stop() {
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39 | if (opened) {
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40 | uint8_t cmd[] = {'j', handle};
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41 | bridge.transfer(cmd, 2);
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42 | }
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43 | opened = false;
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44 | }
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45 |
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46 | void YunClient::doBuffer() {
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47 | // If there are already char in buffer exit
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48 | if (buffered > 0)
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49 | return;
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50 |
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51 | // Try to buffer up to 32 characters
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52 | readPos = 0;
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53 | uint8_t cmd[] = {'K', handle, sizeof(buffer)};
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54 | buffered = bridge.transfer(cmd, 3, buffer, sizeof(buffer));
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55 | }
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56 |
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57 | int YunClient::available() {
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58 | // Look if there is new data available
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59 | doBuffer();
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60 | return buffered;
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61 | }
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62 |
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63 | int YunClient::read() {
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64 | doBuffer();
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65 | if (buffered == 0)
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66 | return -1; // no chars available
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67 | else {
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68 | buffered--;
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69 | return buffer[readPos++];
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70 | }
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71 | }
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72 |
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73 | int YunClient::read(uint8_t *buff, size_t size) {
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74 | int readed = 0;
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75 | do {
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76 | if (buffered == 0) {
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77 | doBuffer();
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78 | if (buffered == 0)
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79 | return readed;
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80 | }
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81 | buff[readed++] = buffer[readPos++];
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82 | buffered--;
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83 | } while (readed < size);
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84 | return readed;
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85 | }
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86 |
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87 | int YunClient::peek() {
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88 | doBuffer();
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89 | if (buffered == 0)
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90 | return -1; // no chars available
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91 | else
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92 | return buffer[readPos];
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93 | }
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94 |
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95 | size_t YunClient::write(uint8_t c) {
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96 | if (!opened)
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97 | return 0;
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98 | uint8_t cmd[] = {'l', handle, c};
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99 | bridge.transfer(cmd, 3);
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100 | return 1;
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101 | }
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102 |
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103 | size_t YunClient::write(const uint8_t *buf, size_t size) {
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104 | if (!opened)
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105 | return 0;
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106 | uint8_t cmd[] = {'l', handle};
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107 | bridge.transfer(cmd, 2, buf, size, NULL, 0);
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108 | return size;
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109 | }
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110 |
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111 | void YunClient::flush() {
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112 | }
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113 |
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114 | uint8_t YunClient::connected() {
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115 | if (!opened)
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116 | return false;
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117 | uint8_t cmd[] = {'L', handle};
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118 | uint8_t res[1];
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119 | bridge.transfer(cmd, 2, res, 1);
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120 | return (res[0] == 1);
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121 | }
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122 |
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123 | int YunClient::connect(IPAddress ip, uint16_t port) {
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124 | String address;
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125 | address.reserve(18);
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126 | address += ip[0];
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127 | address += '.';
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128 | address += ip[1];
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129 | address += '.';
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130 | address += ip[2];
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131 | address += '.';
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132 | address += ip[3];
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133 | return connect(address.c_str(), port);
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134 | }
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135 |
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136 | int YunClient::connect(const char *host, uint16_t port) {
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137 | uint8_t tmp[] = {
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138 | 'C',
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139 | (port >> 8) & 0xFF,
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140 | port & 0xFF
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141 | };
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142 | uint8_t res[1];
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143 | int l = bridge.transfer(tmp, 3, (const uint8_t *)host, strlen(host), res, 1);
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144 | if (l == 0)
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145 | return 0;
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146 | handle = res[0];
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147 |
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148 | // wait for connection
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149 | uint8_t tmp2[] = { 'c', handle };
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150 | uint8_t res2[1];
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151 | while (true) {
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152 | bridge.transfer(tmp2, 2, res2, 1);
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153 | if (res2[0] == 0)
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154 | break;
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155 | delay(1);
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156 | }
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157 | opened = true;
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158 |
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159 | // check for successful connection
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160 | if (connected())
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161 | return 1;
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162 |
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163 | stop();
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164 | handle = 0;
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165 | return 0;
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166 | }
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167 |
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