ESP8266 / ESP8266NodeMCUInterface

ESP8266 driver using the NodeMCU interface

Dependencies:   BufferedSerial

Dependents:   esp8266_nodeMCU1 esp8266_2_thingspeak1 Solarator_0-0-2 IoTBurglar_and_Fire_AlarmSystem ... more

Fork of ESP8266Interface by ESP8266

This is an alternative implementation of the ESP8266 driver that uses the NodeMCU firmware. The NodeMCU firmware provides a slightly larger feature set than the default firmware through a Lua interpreter.

Note

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

Interface changes

  • SSID and passphrase moved out of ESP8266Interface constructor and to ESP8266Interface::connect
  • ESP8266Interface constructor provides optional timeout parameter to specify how long to wait for network operations

Note

NodeMCU defaults to a baud rate of 9600 instead of 115200 used by the default firmware.

Firmware

To install the NodeMCU firmware, follow the instructions on the Firmware Update wiki page using the nodemcu_integer_0.9.6-dev_20150406.bin binary at address 0x00000 instead of boot_v1.1.bin and user1.bin.

Since the NodeMCU firmware defaults to a baud rate of 9600, the Serial Passthrough program can be used to get direct access to the Lua interpreter running on the ESP8266.

Status

Working features:

  • TCP Client
  • UDP Client Transmit (Currently only UDP Server can recieve messages)
  • Single Connection at a time
  • Station Mode (Connects to AP)
  • DNS Lookups

To be implemented:

  • TCP Server
  • UDP Server
  • UDP Client recieve
  • Multiple Connections tracked through Lua variables
  • AP Mode (Act as access point)
  • IPV6 support (Existing issue with NodeMCU)

Diff: ESP8266/ESP8266.cpp

Revision:
40:0a83315aea0a
Parent:
38:86e75901efc1
Child:
41:264902b160ea
--- a/ESP8266/ESP8266.cpp	Sat May 02 04:08:30 2015 +0000
+++ b/ESP8266/ESP8266.cpp	Mon May 04 12:04:54 2015 +0000
@@ -42,13 +42,11 @@
 #define ESP_MAX_TRY_JOIN 3
 #define ESP_MAXID 4 // the largest possible ID Value (max num of sockets possible)
 
-extern Serial pc;
-
 ESP8266 * ESP8266::inst;
 char* ip = NULL;
 
-ESP8266::ESP8266(   PinName tx, PinName rx, PinName _reset, const char * ssid, const char * phrase, uint32_t baud):
-    wifi(tx, rx), reset_pin(_reset), buf_ESP8266(ESP_MBUFFE_MAX)
+ESP8266::ESP8266(PinName tx, PinName rx, PinName reset, const char *ssid, const char *phrase, uint32_t baud) :
+    wifi(tx, rx), reset_pin(reset), buf_ESP8266(ESP_MBUFFE_MAX)
 {
     INFO("Initializing ESP8266 object");
     memset(&state, 0, sizeof(state));
@@ -59,13 +57,13 @@
         if (this->ssid[i] == ' ')
             this->ssid[i] = '$';
     }
+    
     strcpy(this->phrase, phrase);
     for (int i = 0; i < strlen(phrase); i++) {
         if (this->phrase[i] == ' ')
             this->phrase[i] = '$';
     }
 
-
     inst = this;
     attach_rx(false);
 
@@ -167,7 +165,6 @@
     char portstr[5];
     sprintf(portstr, "%d", port);
     sendCommand(( "AT+CIPSTART=\"UDP\",\"" + (string) ip + "\"," + (string) portstr ).c_str(), "OK", NULL, 10000);
-
     sendCommand("AT+CIPMODE=1", "OK", NULL, 1000);// go into transparent mode
     sendCommand("AT+CIPSEND", ">", NULL, 1000);// go into transparent mode
     //DBG("Data Mode");
@@ -178,8 +175,9 @@
 
 bool ESP8266::close()
 {
+    wait(0.1f);
     send("+++",3);
-    wait(1);
+    wait(1.0f);
     state.cmdMode = true;
     sendCommand("AT+CIPCLOSE","OK", NULL, 10000);
     return true;
@@ -257,9 +255,9 @@
 void ESP8266::reset()
 {
     reset_pin = 0;
-    wait(0.2);
+    wait_us(20);
     reset_pin = 1;
-    wait(1);
+    //wait(1);
 
     //send("+++",3);
     //wait(1);
@@ -289,10 +287,12 @@
 
 void ESP8266::attach_rx(bool callback)
 {
-    if (!callback)
+    if (!callback) {
         wifi.attach(NULL);
-    else
+    }
+    else {
         wifi.attach(this, &ESP8266::handler_rx);
+    }
 }
 
 int ESP8266::readable()
@@ -338,7 +338,7 @@
 {
     char read;
     size_t found = string::npos;
-    string checking;
+    string checking = "";
     Timer tmr;
     int result = 0;
 
@@ -353,10 +353,10 @@
     if (!ACK || !strcmp(ACK, "NO")) {
         for (int i = 0; i < strlen(cmd); i++) {
             result = (putc(cmd[i]) == cmd[i]) ? result + 1 : result;
-            wait(.005); // prevents stuck recieve ready (?) need to let echoed character get read first
+            wait(0.005f); // prevents stuck recieve ready (?) need to let echoed character get read first
         }
         putc(13); //CR
-        wait(.005); // wait for echo
+        wait(0.005f); // wait for echo
         putc(10); //LF
 
     } else {
@@ -370,7 +370,7 @@
             wait(.005); // wait for echo
         }
         putc(13); //CR
-        wait(.005); // wait for echo
+        wait(0.005f); // wait for echo
         putc(10); //LF
 
         while (1) {
@@ -385,17 +385,17 @@
                 return -1;
             } else if (readable()) {
                 read = getc();
-                printf("%c",read); //debug echo
+                //printf("%c",read); //debug echo
                 if ( read != '\r' && read != '\n') {
                     checking += read;
                     found = checking.find(ACK);
                     if (found != string::npos) {
-                        wait(0.01);
+                        wait(0.01f);
 
                         //We flush the buffer
                         while (readable())
                             read = getc();
-                        printf("%c",read); //debug echo
+                        //printf("%c",read); //debug echo
                         break;
                     }
                 }