Juan Carlos Gonzales
esp8266 websocket and socket
Diff: ESP8266.cpp
- Revision:
- 0:46166e7d81a8
diff -r 000000000000 -r 46166e7d81a8 ESP8266.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ESP8266.cpp Fri Jun 12 10:06:12 2015 +0000
@@ -0,0 +1,481 @@
+#include "mbed.h"
+#include "ESP8266.h"
+
+#define MAX_TRY_WRITE 20
+#define MAX_TRY_READ 10
+
+//Debug is disabled by default
+#if 0
+#define DBG(x, ...) std::printf("[WebSocket : DBG]"x"\r\n", ##__VA_ARGS__);
+#define WARN(x, ...) std::printf("[WebSocket : WARN]"x"\r\n", ##__VA_ARGS__);
+#define ERR(x, ...) std::printf("[WebSocket : ERR]"x"\r\n", ##__VA_ARGS__);
+#else
+#define DBG(x, ...)
+#define WARN(x, ...)
+#define ERR(x, ...)
+#endif
+
+#define INFO(x, ...) printf("[WebSocket : INFO]"x"\r\n", ##__VA_ARGS__);
+
+esp8266* esp8266::inst;
+
+esp8266::esp8266(PinName tx,PinName rx,int baudRate, const char *ssid, const char *password,const char *host,const char *port) : Modem(tx,rx,baudRate)
+{
+ inst = this;
+ _ssid=ssid;
+ _password=password;
+ _host=host;
+ _port=port;
+}
+
+bool esp8266::join()
+{
+ char cmd[64];
+ int r;
+ //disable echo
+ sendCmd("ATE0\r\n");
+
+ r=sendCmdAndWaitForResp("AT+CWMODE=1\r\n","OK",DEFAULT_TIMEOUT,CMD);
+ printf("wifi.CWMODE=%d\r\n",r);
+
+ snprintf(cmd,sizeof(cmd),"AT+CWJAP=\"%s\",\"%s\"\r\n",_ssid,_password);
+ printf("mensaje=%s\r\n",cmd);
+ r=sendCmdAndWaitForResp(cmd,"OK",15,CMD);
+ printf("wifi.CWJAP=%d\r\n",r);
+
+ if(r==0) {
+ getip();
+ return true;
+ } else {
+ return false;
+ }
+
+
+}
+
+int esp8266::connect(int socket)
+{
+ char cmd[64];
+ int r;
+
+ r=sendCmdAndWaitForResp("AT+CIPMUX=1\r\n","OK",DEFAULT_TIMEOUT,CMD);
+ printf("socket.CIPMUX1=%d\r\n",r);
+
+
+ sprintf(cmd,"AT+CIPSTART=%d,\"TCP\",\"%s\",%s\r\n",socket,_host,_port);
+ printf("mensaje2=%s\r\n",cmd);
+ r=sendCmdAndWaitForResp(cmd,"CONNECT",15,CMD);
+ printf("socket.AT+CIPSTART=%d\r\n",r);
+
+ return r;
+}
+
+int esp8266::send(int socket,const char * str,int len)
+{
+
+ char cmd[100];
+ cleanBuffer(cmd,100);
+ wait(0.3);
+ if(len > 0) {
+ snprintf(cmd,sizeof(cmd),"AT+CIPSEND=%d,%d\r\n",socket,len);
+ printf("mensaje3=%s\r\n",cmd);
+ if(0 != sendCmdAndWaitForResp(cmd,">",2,CMD)) {
+ return -1;
+ }
+ sendCmd(str);
+
+ }
+ return len;
+}
+
+bool esp8266::disconnect(int socket)
+{
+ char cmd[35];
+ sprintf(cmd,"AT+CIPCLOSE=%d\r\n",socket);
+ sendCmd(cmd);
+
+ return true;
+}
+
+
+void esp8266::reset()
+{
+ sendCmdAndWaitForResp("AT+CWMODE=1\r\n","OK",DEFAULT_TIMEOUT,CMD);
+ sendCmd("AT+RST\r\n");
+}
+
+bool esp8266::is_connected() //RETURN 2 GOT IP 3 CONNECTED 4 DISCONNECTED
+{
+ char resp[20];
+
+ sendCmd("AT+CIPSTATUS\r\n");
+ readBuffer(resp,sizeof(resp),DEFAULT_TIMEOUT/2);
+ if(NULL != strstr(resp,"STATUS:3")) {
+ //+CIPSTATUS: 1,0,"TCP","216.52.233.120","80","CONNECTED"
+ return true;
+ } else {
+ //+CIPSTATUS: 1,0,"TCP","216.52.233.120","80","CLOSED"
+ //+CIPSTATUS: 0,,"","","","INITIAL"
+ return false;
+ }
+}
+
+void esp8266::getip()
+{
+ sendCmd("AT+CIFSR\r\n");
+ readBuffer(_ip,100,10);
+}
+
+void esp8266::set_sta_ip(char * s_ip)
+{
+ int r;
+ char cmd[30];
+ sprintf(cmd,"AT+CIPSTA=\"%s\"\r\n",s_ip);
+ r=sendCmdAndWaitForResp(cmd,"OK",5,CMD);
+ printf("mensaje4=%s\r\n",cmd);
+ printf("cambio ip=%d\r\n",r);
+ getip();
+}
+
+void esp8266::list_ap()
+{
+ int r;
+ r=sendCmdAndWaitForResp("AT+CWLAP\r\n","+",5,CMD);
+ printf("cambio ip=%d\r\n",r);
+ readBuffer(_lap,2000,10);
+}
+
+int esp8266::recv(char* buf, int len)
+{
+ cleanBuffer(buf,len);
+ readBuffer(buf,len,DEFAULT_TIMEOUT/2);
+ return len;
+ //return strlen(buf);
+}
+
+//----------------------------------websocket-------------------------------------------------------
+
+void esp8266::websocket(char * url)
+{
+ int ret = parseURL(url, scheme, sizeof(scheme), host, sizeof(host), &port, path, sizeof(path));
+ if(ret) {
+ ERR("URL parsing failed; please use: \"ws://ip-or-domain[:port]/path\"");
+ return;
+ }
+
+ if(port == 0) { //TODO do handle WSS->443
+ port = 80;
+ }
+
+ if(strcmp(scheme, "ws")) {
+ ERR("Wrong scheme, please use \"ws\" instead");
+ }
+}
+
+int esp8266::parseURL(const char* url, char* scheme, size_t maxSchemeLen, char* host, size_t maxHostLen, uint16_t* port, char* path, size_t maxPathLen) //Parse URL
+{
+ char* schemePtr = (char*) url;
+ char* hostPtr = (char*) strstr(url, "://");
+ if(hostPtr == NULL) {
+ WARN("Could not find host");
+ return -1; //URL is invalid
+ }
+
+ if( maxSchemeLen < hostPtr - schemePtr + 1 ) { //including NULL-terminating char
+ WARN("Scheme str is too small (%d >= %d)", maxSchemeLen, hostPtr - schemePtr + 1);
+ return -1;
+ }
+ memcpy(scheme, schemePtr, hostPtr - schemePtr);
+ scheme[hostPtr - schemePtr] = '\0';
+
+ hostPtr+=3;
+
+ size_t hostLen = 0;
+
+ char* portPtr = strchr(hostPtr, ':');
+ if( portPtr != NULL ) {
+ hostLen = portPtr - hostPtr;
+ portPtr++;
+ if( sscanf(portPtr, "%hu", port) != 1) {
+ WARN("Could not find port");
+ return -1;
+ }
+ } else {
+ *port=0;
+ }
+ char* pathPtr = strchr(hostPtr, '/');
+ if( hostLen == 0 ) {
+ hostLen = pathPtr - hostPtr;
+ }
+
+ if( maxHostLen < hostLen + 1 ) { //including NULL-terminating char
+ WARN("Host str is too small (%d >= %d)", maxHostLen, hostLen + 1);
+ return -1;
+ }
+ memcpy(host, hostPtr, hostLen);
+ host[hostLen] = '\0';
+
+ size_t pathLen;
+ char* fragmentPtr = strchr(hostPtr, '#');
+ if(fragmentPtr != NULL) {
+ pathLen = fragmentPtr - pathPtr;
+ } else {
+ pathLen = strlen(pathPtr);
+ }
+
+ if( maxPathLen < pathLen + 1 ) { //including NULL-terminating char
+ WARN("Path str is too small (%d >= %d)", maxPathLen, pathLen + 1);
+ return -1;
+ }
+ memcpy(path, pathPtr, pathLen);
+ path[pathLen] = '\0';
+
+ return 0;
+}
+
+bool esp8266::w_connect(int socket) {
+ char cmd[200];
+/*
+ while (connect(socket) < 0) {
+ ERR("Unable to connect to (%s) on port (%d)", host, port);
+ wait(0.2);
+ return false;
+ }
+*/
+ // sent http header to upgrade to the ws protocol
+
+ printf("path=%s\r\n",path);
+ printf("host=%s\r\n",host);
+ printf("port=%d\r\n",port);
+
+ sprintf(cmd, "GET %s HTTP/1.1\r\n", path);
+ printf("n-GET=%d\r\n",strlen(cmd));
+ printf("%s\r\n",cmd);
+ write(cmd, strlen(cmd));
+
+ sprintf(cmd, "Host: %s:%d\r\n", host, port);
+ printf("n-host=%d\r\n",strlen(cmd));
+ printf("%s\r\n",cmd);
+ write(cmd, strlen(cmd));
+
+ sprintf(cmd, "Upgrade: WebSocket\r\n");
+ printf("n-up=%d\r\n",strlen(cmd));
+ printf("%s\r\n",cmd);
+ write(cmd, strlen(cmd));
+
+ sprintf(cmd, "Connection: Upgrade\r\n");
+ printf("n-con=%d\r\n",strlen(cmd));
+ printf("%s\r\n",cmd);
+ write(cmd, strlen(cmd));
+
+ sprintf(cmd, "Sec-WebSocket-Key: L159VM0TWUzyDxwJEIEzjw==\r\n");
+ printf("n-key=%d\r\n",strlen(cmd));
+ printf("%s\r\n",cmd);
+ write(cmd, strlen(cmd));
+
+ sprintf(cmd, "Sec-WebSocket-Version: 13\r\n\r\n");
+ printf("n-ver=%d\r\n",strlen(cmd));
+ printf("%s\r\n",cmd);
+ int ret = write(cmd, strlen(cmd));
+ if (ret != strlen(cmd)) {
+ disconnect(socket);
+ ERR("Could not send request");
+ return false;
+ }
+
+ ret = read(cmd, 200, 100);
+ if (ret < 0) {
+ disconnect(socket);
+ ERR("Could not receive answer\r\n");
+ return false;
+ }
+
+ cmd[ret] = '\0';
+ DBG("recv: %s\r\n", cmd);
+
+ if ( strstr(cmd, "DdLWT/1JcX+nQFHebYP+rqEx5xI=") == NULL ) {
+ ERR("Wrong answer from server, got \"%s\" instead\r\n", cmd);
+ do {
+ ret = read(cmd, 200, 100);
+ if (ret < 0) {
+ ERR("Could not receive answer\r\n");
+ return false;
+ }
+ cmd[ret] = '\0';
+ printf("%s",cmd);
+ } while (ret > 0);
+ disconnect(socket);
+ return false;
+ }
+
+ INFO("\r\nhost: %s\r\npath: %s\r\nport: %d\r\n\r\n", host, path, port);
+ return true;
+}
+
+int esp8266::sendLength(uint32_t len, char * msg) { //sendlength(5,msg+1)
+
+ if (len < 126) {
+ msg[0] = len | (1<<7);
+ return 1;
+ } else if (len < 65535) {
+ msg[0] = 126 | (1<<7);
+ msg[1] = (len >> 8) & 0xff;
+ msg[2] = len & 0xff;
+ return 3;
+ } else {
+ msg[0] = 127 | (1<<7);
+ for (int i = 0; i < 8; i++) {
+ msg[i+1] = (len >> i*8) & 0xff;
+ }
+ return 9;
+ }
+}
+
+int esp8266::readChar(char * pC, bool block) {
+ return read(pC, 1, 1);
+}
+
+int esp8266::sendOpcode(uint8_t opcode, char * msg) {
+ msg[0] = 0x80 | (opcode & 0x0f);
+ return 1;
+}
+
+int esp8266::sendMask(char * msg) {
+ for (int i = 0; i < 4; i++) {
+ msg[i] = 0;
+ }
+ return 4;
+}
+
+int esp8266::w_send(char * str) {
+ char msg[strlen(str) + 15]; //msg[20]
+ int idx = 0;
+ idx = sendOpcode(0x01, msg); //msg[0]=0x81
+ idx += sendLength(strlen(str), msg + idx);// sendlength(5,msg+1) idx=2
+ idx += sendMask(msg + idx); //idx=6
+ memcpy(msg+idx, str, strlen(str));
+ int res = write(msg, idx + strlen(str));
+ return res;
+}
+
+bool esp8266::w_read(char * message) {
+ int i = 0;
+ uint32_t len_msg;
+ char opcode = 0;
+ char c;
+ char mask[4] = {0, 0, 0, 0};
+ bool is_masked = false;
+ Timer tmr;
+
+ // read the opcode
+ tmr.start();
+ while (true) {
+ if (tmr.read() > 3) {
+ DBG("timeout ws\r\n");
+ return false;
+ }
+
+ if(!is_connected())
+ {
+ WARN("Connection was closed by server");
+ return false;
+ }
+
+ //----------socket.set_blocking(false, 1);
+ if (recv(&opcode, 1) != 1) {
+
+ //socket.set_blocking(false, 2000);
+ return false;
+ }
+
+ //-----------socket.set_blocking(false, 2000);
+
+ if (opcode == 0x81)
+ break;
+ }
+ DBG("opcode: 0x%X\r\n", opcode);
+
+ readChar(&c);
+ len_msg = c & 0x7f;
+ is_masked = c & 0x80;
+ if (len_msg == 126) {
+ readChar(&c);
+ len_msg = c << 8;
+ readChar(&c);
+ len_msg += c;
+ } else if (len_msg == 127) {
+ len_msg = 0;
+ for (int i = 0; i < 8; i++) {
+ readChar(&c);
+ len_msg += (c << (7-i)*8);
+ }
+ }
+
+ if (len_msg == 0) {
+ return false;
+ }
+ DBG("length: %d\r\n", len_msg);
+
+ if (is_masked) {
+ for (i = 0; i < 4; i++)
+ readChar(&c);
+ mask[i] = c;
+ }
+
+ int nb = read(message, len_msg, len_msg);
+ if (nb != len_msg)
+ return false;
+
+ for (i = 0; i < len_msg; i++) {
+ message[i] = message[i] ^ mask[i % 4];
+ }
+
+ message[len_msg] = '\0';
+
+ return true;
+}
+char* esp8266::getPath() {
+ return path;
+}
+
+int esp8266::write(char * str, int len) {
+ int res = 0, idx = 0;
+
+ for (int j = 0; j < MAX_TRY_WRITE; j++) {
+ /*
+ if(!is_connected())
+ {
+ WARN("Connection was closed by server");
+ break;
+ }
+ */
+ if ((res = send(4,str + idx,len - idx)) == -1)
+ continue;
+
+ idx += res;
+
+ if (idx == len)
+ return len;
+ }
+
+ return (idx == 0) ? -1 : idx;
+}
+
+int esp8266::read(char * str, int len, int min_len) {
+ int res = 0, idx = 0;
+
+ for (int j = 0; j < MAX_TRY_WRITE; j++) {
+
+ if ((res = recv(str + idx, len - idx)) == -1)
+ continue;
+
+ idx += res;
+
+ if (idx == len || (min_len != -1 && idx > min_len))
+ return idx;
+ }
+
+ return (idx == 0) ? -1 : idx;
+}
+
+