ittraining_project_2016 / ESP8266Interface

for testing wifi

Dependents:   ESP8266_Test_WIFI

Fork of ESP8266Interface by Steve Kim

Socket/UDPSocket.cpp@52:b4a3e584db90, 2016-06-28 (annotated)

Committer:
hank51017
Date:
Tue Jun 28 10:56:14 2016 +0000
Revision:
52:b4a3e584db90
Parent:
45:c180905b5b79 
for downloading

Who changed what in which revision?

UserRevisionLine numberNew contents of line
samux 1:fb4494783863 1 /* Copyright (C) 2012 mbed.org, MIT License
samux 1:fb4494783863 2 *
samux 1:fb4494783863 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
samux 1:fb4494783863 4 * and associated documentation files (the "Software"), to deal in the Software without restriction,
samux 1:fb4494783863 5 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
samux 1:fb4494783863 6 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
samux 1:fb4494783863 7 * furnished to do so, subject to the following conditions:
samux 1:fb4494783863 8 *
samux 1:fb4494783863 9 * The above copyright notice and this permission notice shall be included in all copies or
samux 1:fb4494783863 10 * substantial portions of the Software.
samux 1:fb4494783863 11 *
samux 1:fb4494783863 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
samux 1:fb4494783863 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
samux 1:fb4494783863 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
samux 1:fb4494783863 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
samux 1:fb4494783863 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
samux 1:fb4494783863 17 */
samux 1:fb4494783863 18
samux 1:fb4494783863 19 #include "UDPSocket.h"
samux 1:fb4494783863 20
samux 1:fb4494783863 21 #include <string>
samux 1:fb4494783863 22 #include <algorithm>
samux 1:fb4494783863 23
samux 1:fb4494783863 24 UDPSocket::UDPSocket()
samux 1:fb4494783863 25 {
samux 1:fb4494783863 26 endpoint_configured = false;
samux 1:fb4494783863 27 endpoint_read = false;
michaeljkoster 19:fb8d5bff2076 28 Endpoint currentEndpoint;
samux 1:fb4494783863 29 }
samux 1:fb4494783863 30
samux 1:fb4494783863 31 int UDPSocket::init(void)
samux 1:fb4494783863 32 {
samux 1:fb4494783863 33 return 0;
samux 1:fb4494783863 34 }
samux 1:fb4494783863 35
samux 1:fb4494783863 36 // Server initialization
samux 1:fb4494783863 37 int UDPSocket::bind(int port)
samux 1:fb4494783863 38 {
samux 1:fb4494783863 39 return 0;
samux 1:fb4494783863 40 }
samux 1:fb4494783863 41
samux 1:fb4494783863 42 // -1 if unsuccessful, else number of bytes written
samux 1:fb4494783863 43 int UDPSocket::sendTo(Endpoint &remote, char *packet, int length)
samux 1:fb4494783863 44 {
samux 1:fb4494783863 45 Timer tmr;
samux 1:fb4494783863 46 int idx = 0;
samux 1:fb4494783863 47
mbedAustin 34:7ccda5d68a00 48
samux 1:fb4494783863 49 confEndpoint(remote);
mbedAustin 39:89e259295728 50
mbedAustin 34:7ccda5d68a00 51 // initialize transparent mode if not already done
mbedAustin 34:7ccda5d68a00 52 if(!endpoint_configured) {
mbedAustin 34:7ccda5d68a00 53 // initialize UDP (default id of -1 means transparent mode)
sarahmarshy 44:3a7b6083210b 54 //!wifi->start(ESP_UDP_TYPE, remote._ipAddress, remote._port, remote._id
sarahmarshy 44:3a7b6083210b 55 if(!wifi->startUDP(remote._ipAddress, remote._port, 0,length)) {
mbedAustin 34:7ccda5d68a00 56 return(-1);
mbedAustin 34:7ccda5d68a00 57 }
mbedAustin 34:7ccda5d68a00 58 endpoint_configured = true;
mbedAustin 34:7ccda5d68a00 59 }
mbedAustin 39:89e259295728 60
samux 1:fb4494783863 61 tmr.start();
samux 1:fb4494783863 62
samux 1:fb4494783863 63 while ((tmr.read_ms() < _timeout) || _blocking) {
samux 1:fb4494783863 64
mbedAustin 31:fd0eaf273b11 65 idx += wifi->send(packet, length);
samux 1:fb4494783863 66
samux 1:fb4494783863 67 if (idx == length)
samux 1:fb4494783863 68 return idx;
samux 1:fb4494783863 69 }
samux 1:fb4494783863 70 return (idx == 0) ? -1 : idx;
samux 1:fb4494783863 71 }
samux 1:fb4494783863 72
samux 1:fb4494783863 73 // -1 if unsuccessful, else number of bytes received
samux 1:fb4494783863 74 int UDPSocket::receiveFrom(Endpoint &remote, char *buffer, int length)
samux 1:fb4494783863 75 {
samux 1:fb4494783863 76 Timer tmr;
samux 1:fb4494783863 77 int idx = 0;
samux 1:fb4494783863 78 int nb_available = 0;
samux 1:fb4494783863 79 int time = -1;
mbedAustin 34:7ccda5d68a00 80
michaeljkoster 27:9c6cefc12f0c 81 //make this the non-blocking case and return if <= 0
michaeljkoster 27:9c6cefc12f0c 82 // remember to change the config to blocking
michaeljkoster 27:9c6cefc12f0c 83 // if ( ! _blocking) {
mbedAustin 34:7ccda5d68a00 84 // if ( wifi.readable <= 0 ) {
mbedAustin 34:7ccda5d68a00 85 // return (wifi.readable);
mbedAustin 34:7ccda5d68a00 86 // }
michaeljkoster 27:9c6cefc12f0c 87 // }
michaeljkoster 27:9c6cefc12f0c 88 //---
michaeljkoster 22:c4360e61486a 89 tmr.start();
samux 1:fb4494783863 90 if (_blocking) {
samux 1:fb4494783863 91 while (1) {
samux 1:fb4494783863 92 nb_available = wifi->readable();
samux 1:fb4494783863 93 if (nb_available != 0) {
samux 1:fb4494783863 94 break;
samux 1:fb4494783863 95 }
samux 1:fb4494783863 96 }
michaeljkoster 21:690526f05fe6 97 }
michaeljkoster 27:9c6cefc12f0c 98 //---
michaeljkoster 27:9c6cefc12f0c 99 // blocking case
michaeljkoster 21:690526f05fe6 100 else {
michaeljkoster 22:c4360e61486a 101 tmr.reset();
mbedAustin 34:7ccda5d68a00 102
mbedAustin 34:7ccda5d68a00 103 while (time < _timeout) {
michaeljkoster 21:690526f05fe6 104 nb_available = wifi->readable();
michaeljkoster 21:690526f05fe6 105 if (nb_available < 0) return nb_available;
michaeljkoster 21:690526f05fe6 106 if (nb_available > 0) break ;
michaeljkoster 21:690526f05fe6 107 time = tmr.read_ms();
michaeljkoster 21:690526f05fe6 108 }
mbedAustin 34:7ccda5d68a00 109
mbedAustin 34:7ccda5d68a00 110 if (nb_available == 0) return nb_available;
mbedAustin 34:7ccda5d68a00 111 }
mbedAustin 34:7ccda5d68a00 112
michaeljkoster 27:9c6cefc12f0c 113 // change this to < 20 mS timeout per byte to detect end of packet gap
michaeljkoster 27:9c6cefc12f0c 114 // this may not work due to buffering at the UART interface
michaeljkoster 22:c4360e61486a 115 tmr.reset();
michaeljkoster 27:9c6cefc12f0c 116 // while ( tmr.read_ms() < 20 ) {
mbedAustin 34:7ccda5d68a00 117 // if ( wifi.readable() && (idx < length) ) {
mbedAustin 34:7ccda5d68a00 118 // buffer[idx++] = wifi->getc();
mbedAustin 34:7ccda5d68a00 119 // tmr.reset();
mbedAustin 34:7ccda5d68a00 120 // }
mbedAustin 34:7ccda5d68a00 121 // if ( idx == length ) {
mbedAustin 34:7ccda5d68a00 122 // break;
mbedAustin 34:7ccda5d68a00 123 // }
michaeljkoster 27:9c6cefc12f0c 124 // }
michaeljkoster 27:9c6cefc12f0c 125 //---
samux 1:fb4494783863 126 while (time < _timeout) {
samux 1:fb4494783863 127
samux 1:fb4494783863 128 nb_available = wifi->readable();
michaeljkoster 23:de9221771e96 129 //for (int i = 0; i < min(nb_available, length); i++) {
michaeljkoster 23:de9221771e96 130 for (int i = 0; i < min(nb_available, (length-idx)); i++) {
samux 1:fb4494783863 131 buffer[idx] = wifi->getc();
samux 1:fb4494783863 132 idx++;
samux 1:fb4494783863 133 }
samux 1:fb4494783863 134 if (idx == length) {
samux 1:fb4494783863 135 break;
samux 1:fb4494783863 136 }
samux 1:fb4494783863 137 time = tmr.read_ms();
samux 1:fb4494783863 138 }
michaeljkoster 27:9c6cefc12f0c 139 //---
samux 1:fb4494783863 140 readEndpoint(remote);
samux 1:fb4494783863 141 return (idx == 0) ? -1 : idx;
samux 1:fb4494783863 142 }
samux 1:fb4494783863 143
samux 1:fb4494783863 144 bool UDPSocket::confEndpoint(Endpoint & ep)
samux 1:fb4494783863 145 {
michaeljkoster 19:fb8d5bff2076 146 currentEndpoint = ep;
samux 1:fb4494783863 147 return true;
samux 1:fb4494783863 148 }
samux 1:fb4494783863 149
samux 1:fb4494783863 150 bool UDPSocket::readEndpoint(Endpoint & ep)
samux 1:fb4494783863 151 {
michaeljkoster 19:fb8d5bff2076 152 ep = currentEndpoint;
michaeljkoster 16:3f0efaa57a12 153 return true;
samux 1:fb4494783863 154 }