ESP8266 / ESP8266Interface

ESP8266 Socket Library. AT Thinker firmware.

Dependents:   ESP8266_MQTT_HelloWorld ESP8266_IFTTT_Test ECE_4180_Lab_4 websocketmbed ... more

Fork of ESP8266Interface by ESP8266

This repository has been superceded

This project has moved to https://developer.mbed.org/teams/ESP8266/code/esp8266-driver/

This library works with the AT Thinker firmware.

Note

This library is currently in Beta. It is not feature complete and has some bugs, proceed with caution! Fixes and patches are welcome and appreciated!

Currently the ESP8266Interface Library has the following Abilities:

Working

  • TCP Client
  • UDP Client
  • Transparent mode (single connection of 1 type at a time)
  • Station Mode (connects to AP)

To be implemented

  • TCP Server
  • UDP Server
  • Multi Connection Mode (able to have up to 5 sockets at a time)
  • AP Mode (Make ESP Chip act like access point)
  • DNS Support (currently websites must be looked up by IP)
  • Error Recovery

Nice but not necessary

  • colorized text for ESP AT Commands in Command line (easier to differentiate from other text)

ESP8266/ESP8266.cpp@16:3f0efaa57a12, 2014-12-01 (annotated)

Committer:
michaeljkoster
Date:
Mon Dec 01 06:22:00 2014 +0000
Revision:
16:3f0efaa57a12
Parent:
15:37a7a56a424f
Child:
17:d11fa4c3ac65
sync

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 "mbed.h"
michaeljkoster 13:41098c907200 20 #include "ESP8266.h"
michaeljkoster 16:3f0efaa57a12 21 #include "Endpoint.h"
samux 1:fb4494783863 22 #include <string>
samux 1:fb4494783863 23 #include <algorithm>
samux 1:fb4494783863 24
samux 1:fb4494783863 25 //Debug is disabled by default
screamer 10:131675c17372 26 #if (defined(DEBUG))
michaeljkoster 13:41098c907200 27 #define DBG(x, ...) std::printf("[ESP8266 : DBG]"x"\r\n", ##__VA_ARGS__);
michaeljkoster 13:41098c907200 28 #define WARN(x, ...) std::printf("[ESP8266 : WARN]"x"\r\n", ##__VA_ARGS__);
michaeljkoster 13:41098c907200 29 #define ERR(x, ...) std::printf("[ESP8266 : ERR]"x"\r\n", ##__VA_ARGS__);
samux 1:fb4494783863 30 #else
samux 1:fb4494783863 31 #define DBG(x, ...)
samux 1:fb4494783863 32 #define WARN(x, ...)
samux 1:fb4494783863 33 #define ERR(x, ...)
samux 1:fb4494783863 34 #endif
samux 1:fb4494783863 35
screamer 10:131675c17372 36 #if defined(DEBUG)
michaeljkoster 13:41098c907200 37 #define INFO(x, ...) printf("[ESP8266 : INFO]"x"\r\n", ##__VA_ARGS__);
samux 1:fb4494783863 38 #else
samux 1:fb4494783863 39 #define INFO(x, ...)
samux 1:fb4494783863 40 #endif
samux 1:fb4494783863 41
samux 1:fb4494783863 42 #define MAX_TRY_JOIN 3
samux 1:fb4494783863 43
michaeljkoster 12:c5f0eac67a8a 44 extern Serial pc;
michaeljkoster 12:c5f0eac67a8a 45
michaeljkoster 13:41098c907200 46 ESP8266 * ESP8266::inst;
samux 1:fb4494783863 47
michaeljkoster 13:41098c907200 48 ESP8266::ESP8266( PinName tx, PinName rx, PinName _reset, const char * ssid, const char * phrase ):
michaeljkoster 13:41098c907200 49 wifi(tx, rx), reset_pin(_reset), buf_ESP8266(256)
samux 1:fb4494783863 50 {
samux 1:fb4494783863 51 memset(&state, 0, sizeof(state));
samux 1:fb4494783863 52
samux 1:fb4494783863 53 // change all ' ' in '$' in the ssid and the passphrase
samux 1:fb4494783863 54 strcpy(this->ssid, ssid);
samux 1:fb4494783863 55 for (int i = 0; i < strlen(ssid); i++) {
samux 1:fb4494783863 56 if (this->ssid[i] == ' ')
samux 1:fb4494783863 57 this->ssid[i] = '$';
samux 1:fb4494783863 58 }
samux 1:fb4494783863 59 strcpy(this->phrase, phrase);
samux 1:fb4494783863 60 for (int i = 0; i < strlen(phrase); i++) {
samux 1:fb4494783863 61 if (this->phrase[i] == ' ')
samux 1:fb4494783863 62 this->phrase[i] = '$';
samux 1:fb4494783863 63 }
samux 1:fb4494783863 64
samux 1:fb4494783863 65 inst = this;
samux 1:fb4494783863 66 attach_rx(false);
michaeljkoster 16:3f0efaa57a12 67
michaeljkoster 16:3f0efaa57a12 68 wifi.baud(9600); // initial baud rate of the ESP8266
michaeljkoster 16:3f0efaa57a12 69 pc.printf("ESP8266 test\r\n");
samux 1:fb4494783863 70 }
samux 1:fb4494783863 71
michaeljkoster 13:41098c907200 72 bool ESP8266::join()
samux 1:fb4494783863 73 {
michaeljkoster 16:3f0efaa57a12 74 string cmd="AT+CWJAP=\""+(string)this->ssid+"\",\""+(string)this->phrase+"\"";
michaeljkoster 16:3f0efaa57a12 75 if( sendCommand( cmd.c_str(), "OK", NULL, 10000) ){
michaeljkoster 16:3f0efaa57a12 76 // successfully joined the network
samux 1:fb4494783863 77 state.associated = true;
michaeljkoster 13:41098c907200 78 INFO("\r\nssid: %s\r\nphrase: %s\r\nsecurity: %s\r\n\r\n", this->ssid, this->phrase);
samux 1:fb4494783863 79 return true;
samux 1:fb4494783863 80 }
samux 1:fb4494783863 81 return false;
samux 1:fb4494783863 82 }
samux 1:fb4494783863 83
michaeljkoster 13:41098c907200 84 bool ESP8266::connect()
samux 1:fb4494783863 85 {
michaeljkoster 16:3f0efaa57a12 86 return true;
samux 1:fb4494783863 87 }
samux 1:fb4494783863 88
michaeljkoster 15:37a7a56a424f 89 bool ESP8266::is_connected()
michaeljkoster 15:37a7a56a424f 90 {
michaeljkoster 15:37a7a56a424f 91 return true;
michaeljkoster 15:37a7a56a424f 92 }
michaeljkoster 15:37a7a56a424f 93
michaeljkoster 16:3f0efaa57a12 94 bool ESP8266::startUDP(char* ip, int port){
michaeljkoster 16:3f0efaa57a12 95 char* portstr = "";
michaeljkoster 16:3f0efaa57a12 96 sprintf(portstr, "%d", port);
michaeljkoster 16:3f0efaa57a12 97
michaeljkoster 16:3f0efaa57a12 98 sendCommand(( "AT+CIPSTART=\"UDP\",\"" + (string) ip + "\"" + (string) portstr + "\"").c_str(), "OK", NULL, 10000);
michaeljkoster 16:3f0efaa57a12 99
michaeljkoster 16:3f0efaa57a12 100 sendCommand("AT+CIPSEND", "OK", NULL, 1000);// go into transparent mode
michaeljkoster 16:3f0efaa57a12 101
michaeljkoster 16:3f0efaa57a12 102 return true;
michaeljkoster 16:3f0efaa57a12 103 }
michaeljkoster 16:3f0efaa57a12 104
michaeljkoster 15:37a7a56a424f 105 bool ESP8266::close()
michaeljkoster 15:37a7a56a424f 106 {
michaeljkoster 16:3f0efaa57a12 107 sendCommand("AT+CIPCLOSE","OK", NULL, 10000);
michaeljkoster 15:37a7a56a424f 108 return true;
michaeljkoster 15:37a7a56a424f 109 }
michaeljkoster 15:37a7a56a424f 110
michaeljkoster 15:37a7a56a424f 111 bool ESP8266::disconnect()
michaeljkoster 15:37a7a56a424f 112 {
michaeljkoster 15:37a7a56a424f 113 // if already disconnected, return
michaeljkoster 15:37a7a56a424f 114 if (!state.associated)
michaeljkoster 15:37a7a56a424f 115 return true;
michaeljkoster 15:37a7a56a424f 116 // send command to quit AP
michaeljkoster 16:3f0efaa57a12 117 sendCommand("AT+CWQAP", "OK", NULL, 10000);
michaeljkoster 15:37a7a56a424f 118 state.associated = false;
michaeljkoster 15:37a7a56a424f 119 return true;
michaeljkoster 15:37a7a56a424f 120 }
michaeljkoster 15:37a7a56a424f 121
michaeljkoster 15:37a7a56a424f 122 char* ESP8266::getIPAddress()
michaeljkoster 15:37a7a56a424f 123 {
michaeljkoster 16:3f0efaa57a12 124 sendCommand("AT+CWLIF", "OK", NULL, 10000);
michaeljkoster 15:37a7a56a424f 125 return ipString;
michaeljkoster 15:37a7a56a424f 126 }
michaeljkoster 15:37a7a56a424f 127
michaeljkoster 13:41098c907200 128 bool ESP8266::gethostbyname(const char * host, char * ip)
samux 1:fb4494783863 129 {
samux 1:fb4494783863 130 string h = host;
samux 1:fb4494783863 131 int nb_digits = 0;
samux 1:fb4494783863 132
samux 1:fb4494783863 133 // no dns needed
samux 1:fb4494783863 134 int pos = h.find(".");
samux 1:fb4494783863 135 if (pos != string::npos) {
samux 1:fb4494783863 136 string sub = h.substr(0, h.find("."));
samux 1:fb4494783863 137 nb_digits = atoi(sub.c_str());
samux 1:fb4494783863 138 }
samux 1:fb4494783863 139 //printf("substrL %s\r\n", sub.c_str());
samux 1:fb4494783863 140 if (count(h.begin(), h.end(), '.') == 3 && nb_digits > 0) {
samux 1:fb4494783863 141 strcpy(ip, host);
michaeljkoster 13:41098c907200 142 return true;
samux 1:fb4494783863 143 }
samux 1:fb4494783863 144 else {
michaeljkoster 13:41098c907200 145 // dns needed, not currently available
michaeljkoster 13:41098c907200 146 return false;
michaeljkoster 13:41098c907200 147 }
michaeljkoster 13:41098c907200 148 }
samux 1:fb4494783863 149
michaeljkoster 13:41098c907200 150 void ESP8266::reset()
samux 1:fb4494783863 151 {
michaeljkoster 16:3f0efaa57a12 152 sendCommand("AT+RST", "ready", NULL, 10000);
michaeljkoster 16:3f0efaa57a12 153 /*
samux 1:fb4494783863 154 reset_pin = 0;
samux 1:fb4494783863 155 wait(0.2);
samux 1:fb4494783863 156 reset_pin = 1;
samux 1:fb4494783863 157 wait(0.2);
michaeljkoster 16:3f0efaa57a12 158 */
samux 1:fb4494783863 159 }
samux 1:fb4494783863 160
michaeljkoster 13:41098c907200 161 bool ESP8266::reboot()
samux 3:9aa05e19c62e 162 {
michaeljkoster 16:3f0efaa57a12 163 reset();
samux 3:9aa05e19c62e 164 return true;
samux 3:9aa05e19c62e 165 }
samux 3:9aa05e19c62e 166
michaeljkoster 15:37a7a56a424f 167 void ESP8266::handler_rx(void)
samux 1:fb4494783863 168 {
michaeljkoster 15:37a7a56a424f 169 //read characters
michaeljkoster 16:3f0efaa57a12 170 char c;
michaeljkoster 16:3f0efaa57a12 171 while (wifi.readable()){
michaeljkoster 16:3f0efaa57a12 172 c=wifi.getc();
michaeljkoster 16:3f0efaa57a12 173 buf_ESP8266.queue(c);
michaeljkoster 16:3f0efaa57a12 174 //pc.printf("%c",c);
michaeljkoster 16:3f0efaa57a12 175 }
michaeljkoster 15:37a7a56a424f 176 }
michaeljkoster 15:37a7a56a424f 177
michaeljkoster 15:37a7a56a424f 178 void ESP8266::attach_rx(bool callback)
michaeljkoster 15:37a7a56a424f 179 {
michaeljkoster 15:37a7a56a424f 180 if (!callback)
michaeljkoster 15:37a7a56a424f 181 wifi.attach(NULL);
michaeljkoster 15:37a7a56a424f 182 else
michaeljkoster 15:37a7a56a424f 183 wifi.attach(this, &ESP8266::handler_rx);
samux 1:fb4494783863 184 }
samux 1:fb4494783863 185
michaeljkoster 13:41098c907200 186 int ESP8266::readable()
samux 1:fb4494783863 187 {
michaeljkoster 13:41098c907200 188 return buf_ESP8266.available();
samux 1:fb4494783863 189 }
samux 1:fb4494783863 190
michaeljkoster 13:41098c907200 191 int ESP8266::writeable()
samux 1:fb4494783863 192 {
samux 1:fb4494783863 193 return wifi.writeable();
samux 1:fb4494783863 194 }
samux 1:fb4494783863 195
michaeljkoster 13:41098c907200 196 char ESP8266::getc()
samux 1:fb4494783863 197 {
michaeljkoster 14:4d1128f72e00 198 char c=0;
michaeljkoster 13:41098c907200 199 while (!buf_ESP8266.available());
michaeljkoster 13:41098c907200 200 buf_ESP8266.dequeue(&c);
samux 1:fb4494783863 201 return c;
samux 1:fb4494783863 202 }
samux 1:fb4494783863 203
michaeljkoster 15:37a7a56a424f 204 int ESP8266::putc(char c)
samux 1:fb4494783863 205 {
michaeljkoster 15:37a7a56a424f 206 while (!wifi.writeable());
michaeljkoster 15:37a7a56a424f 207 return wifi.putc(c);
samux 1:fb4494783863 208 }
samux 1:fb4494783863 209
michaeljkoster 15:37a7a56a424f 210 void ESP8266::flush()
samux 1:fb4494783863 211 {
michaeljkoster 15:37a7a56a424f 212 buf_ESP8266.flush();
samux 1:fb4494783863 213 }
samux 1:fb4494783863 214
michaeljkoster 16:3f0efaa57a12 215 int ESP8266::send(const char * buf, int len)
michaeljkoster 15:37a7a56a424f 216 {
michaeljkoster 16:3f0efaa57a12 217 const char* bufptr=buf;
michaeljkoster 16:3f0efaa57a12 218 while(!wifi.writeable()){}
michaeljkoster 16:3f0efaa57a12 219 for(int i=0; i<len; i++){
michaeljkoster 16:3f0efaa57a12 220 wifi.putc((int)*bufptr++);
michaeljkoster 16:3f0efaa57a12 221 while(!wifi.writeable()){}
michaeljkoster 16:3f0efaa57a12 222 }return true;
michaeljkoster 15:37a7a56a424f 223 }
samux 1:fb4494783863 224
michaeljkoster 16:3f0efaa57a12 225 bool ESP8266::sendCommand(const char * cmd, const char * ACK, char * res, int timeout)
samux 1:fb4494783863 226 {
samux 1:fb4494783863 227 char read;
samux 1:fb4494783863 228 size_t found = string::npos;
samux 1:fb4494783863 229 string checking;
samux 1:fb4494783863 230 Timer tmr;
samux 1:fb4494783863 231 int result = 0;
samux 1:fb4494783863 232
michaeljkoster 16:3f0efaa57a12 233 DBG("will send: %s\r\n",cmd);
samux 1:fb4494783863 234
samux 1:fb4494783863 235 attach_rx(false);
samux 1:fb4494783863 236
samux 1:fb4494783863 237 //We flush the buffer
samux 1:fb4494783863 238 while (wifi.readable())
samux 1:fb4494783863 239 wifi.getc();
michaeljkoster 16:3f0efaa57a12 240
michaeljkoster 16:3f0efaa57a12 241 while(!wifi.writeable()){};
samux 1:fb4494783863 242
samux 1:fb4494783863 243 if (!ACK || !strcmp(ACK, "NO")) {
michaeljkoster 16:3f0efaa57a12 244 for (int i = 0; i < sizeof(cmd); i++){
michaeljkoster 16:3f0efaa57a12 245 result = (putc(cmd[i]) == cmd[i]) ? result + 1 : result;
michaeljkoster 16:3f0efaa57a12 246 while(!wifi.writeable()){};
michaeljkoster 16:3f0efaa57a12 247 }
michaeljkoster 16:3f0efaa57a12 248 putc(13); //CR
michaeljkoster 16:3f0efaa57a12 249 while(!wifi.writeable()){};
michaeljkoster 16:3f0efaa57a12 250 putc(10); //LF
michaeljkoster 16:3f0efaa57a12 251
samux 1:fb4494783863 252 } else {
samux 1:fb4494783863 253 //We flush the buffer
samux 1:fb4494783863 254 while (wifi.readable())
samux 1:fb4494783863 255 wifi.getc();
samux 1:fb4494783863 256
samux 1:fb4494783863 257 tmr.start();
michaeljkoster 16:3f0efaa57a12 258 for (int i = 0; i < sizeof(cmd); i++){
michaeljkoster 16:3f0efaa57a12 259 result = (putc(cmd[i]) == cmd[i]) ? result + 1 : result;
michaeljkoster 16:3f0efaa57a12 260 while(!wifi.writeable()){};
michaeljkoster 16:3f0efaa57a12 261 }
michaeljkoster 16:3f0efaa57a12 262 putc(13); //CR
michaeljkoster 16:3f0efaa57a12 263 while(!wifi.writeable()){};
michaeljkoster 16:3f0efaa57a12 264 putc(10); //LF
samux 1:fb4494783863 265
samux 1:fb4494783863 266 while (1) {
samux 1:fb4494783863 267 if (tmr.read_ms() > timeout) {
samux 1:fb4494783863 268 //We flush the buffer
samux 1:fb4494783863 269 while (wifi.readable())
samux 1:fb4494783863 270 wifi.getc();
samux 1:fb4494783863 271
samux 1:fb4494783863 272 DBG("check: %s\r\n", checking.c_str());
samux 1:fb4494783863 273
samux 1:fb4494783863 274 attach_rx(true);
samux 1:fb4494783863 275 return -1;
samux 1:fb4494783863 276 } else if (wifi.readable()) {
samux 1:fb4494783863 277 read = wifi.getc();
michaeljkoster 16:3f0efaa57a12 278 pc.putc(read);//debug
samux 1:fb4494783863 279 if ( read != '\r' && read != '\n') {
samux 1:fb4494783863 280 checking += read;
samux 1:fb4494783863 281 found = checking.find(ACK);
samux 1:fb4494783863 282 if (found != string::npos) {
samux 1:fb4494783863 283 wait(0.01);
samux 1:fb4494783863 284
samux 1:fb4494783863 285 //We flush the buffer
samux 1:fb4494783863 286 while (wifi.readable())
samux 1:fb4494783863 287 wifi.getc();
samux 1:fb4494783863 288
samux 1:fb4494783863 289 break;
samux 1:fb4494783863 290 }
samux 1:fb4494783863 291 }
samux 1:fb4494783863 292 }
samux 1:fb4494783863 293 }
samux 1:fb4494783863 294 DBG("check: %s\r\n", checking.c_str());
samux 1:fb4494783863 295
samux 1:fb4494783863 296 attach_rx(true);
samux 1:fb4494783863 297 return result;
samux 1:fb4494783863 298 }
samux 1:fb4494783863 299
samux 1:fb4494783863 300 //the user wants the result from the command (ACK == NULL, res != NULL)
samux 1:fb4494783863 301 if ( res != NULL) {
samux 1:fb4494783863 302 int i = 0;
samux 1:fb4494783863 303 Timer timeout;
samux 1:fb4494783863 304 timeout.start();
samux 1:fb4494783863 305 tmr.reset();
samux 1:fb4494783863 306 while (1) {
samux 1:fb4494783863 307 if (timeout.read() > 2) {
samux 1:fb4494783863 308 if (i == 0) {
samux 1:fb4494783863 309 res = NULL;
samux 1:fb4494783863 310 break;
samux 1:fb4494783863 311 }
samux 1:fb4494783863 312 res[i] = '\0';
samux 1:fb4494783863 313 DBG("user str 1: %s\r\n", res);
samux 1:fb4494783863 314
samux 1:fb4494783863 315 break;
samux 1:fb4494783863 316 } else {
samux 1:fb4494783863 317 if (tmr.read_ms() > 300) {
samux 1:fb4494783863 318 res[i] = '\0';
samux 1:fb4494783863 319 DBG("user str: %s\r\n", res);
samux 1:fb4494783863 320
samux 1:fb4494783863 321 break;
samux 1:fb4494783863 322 }
samux 1:fb4494783863 323 if (wifi.readable()) {
samux 1:fb4494783863 324 tmr.start();
samux 1:fb4494783863 325 read = wifi.getc();
samux 1:fb4494783863 326
samux 1:fb4494783863 327 // we drop \r and \n
samux 1:fb4494783863 328 if ( read != '\r' && read != '\n') {
samux 1:fb4494783863 329 res[i++] = read;
samux 1:fb4494783863 330 }
samux 1:fb4494783863 331 }
samux 1:fb4494783863 332 }
samux 1:fb4494783863 333 }
samux 1:fb4494783863 334 DBG("user str: %s\r\n", res);
samux 1:fb4494783863 335 }
samux 1:fb4494783863 336
samux 1:fb4494783863 337 //We flush the buffer
samux 1:fb4494783863 338 while (wifi.readable())
samux 1:fb4494783863 339 wifi.getc();
samux 1:fb4494783863 340
samux 1:fb4494783863 341 attach_rx(true);
samux 1:fb4494783863 342 DBG("result: %d\r\n", result)
samux 1:fb4494783863 343 return result;
michaeljkoster 15:37a7a56a424f 344 }
michaeljkoster 16:3f0efaa57a12 345
michaeljkoster 16:3f0efaa57a12 346 void ESP8266::ATcommand(char* command){
michaeljkoster 16:3f0efaa57a12 347 char* cmd=command;
michaeljkoster 16:3f0efaa57a12 348 while(!wifi.writeable() || wifi.readable()){}
michaeljkoster 16:3f0efaa57a12 349 while(*cmd){
michaeljkoster 16:3f0efaa57a12 350 wifi.putc((int)*cmd++);
michaeljkoster 16:3f0efaa57a12 351 wait(.005); // wait for the echo
michaeljkoster 16:3f0efaa57a12 352 while(!wifi.writeable() || wifi.readable()){}
michaeljkoster 16:3f0efaa57a12 353 }
michaeljkoster 16:3f0efaa57a12 354 wifi.putc(13); //CR
michaeljkoster 16:3f0efaa57a12 355 while(!wifi.writeable() || wifi.readable()){}
michaeljkoster 16:3f0efaa57a12 356 wifi.putc(10); //LF
michaeljkoster 16:3f0efaa57a12 357 }