From 27d5ac00d3572b8c0a5547c37995578b3f4c1240 Mon Sep 17 00:00:00 2001
From: Vido <vido@usp.br>
Date: Fri, 20 Nov 2015 18:58:56 -0200
Subject: [PATCH] AltSoftSerial support

---
 ESP8266.cpp |  7 +++++++
 ESP8266.h   | 18 ++++++++++++++++++
 README.md   | 14 ++++++++++++++
 3 files changed, 39 insertions(+)

diff --git a/ESP8266.cpp b/ESP8266.cpp
index 47bcc7c..0fe3b99 100644
--- a/ESP8266.cpp
+++ b/ESP8266.cpp
@@ -47,6 +47,13 @@ ESP8266::ESP8266(SoftwareSerial &uart, uint32_t baud): m_puart(&uart)
     m_puart->begin(baud);
     rx_empty();
 }
+#elif defined(ESP8266_USE_ALTSOFT_SERIAL)
+ESP8266::ESP8266(AltSoftSerial &uart, uint32_t baud): m_puart(&uart)
+{
+    m_puart->begin(baud);
+    rx_empty();
+}
+
 #else
 ESP8266::ESP8266(HardwareSerial &uart, uint32_t baud): m_puart(&uart)
 {
diff --git a/ESP8266.h b/ESP8266.h
index bf82755..d07755e 100644
--- a/ESP8266.h
+++ b/ESP8266.h
@@ -25,12 +25,16 @@
 
 
 //#define ESP8266_USE_SOFTWARE_SERIAL
+//#define ESP8266_USE_ALTSOFT_SERIAL
 
 
 #ifdef ESP8266_USE_SOFTWARE_SERIAL
 #include "SoftwareSerial.h"
 #endif
 
+#ifdef ESP8266_USE_ALTSOFT_SERIAL
+#include "AltSoftSerial.h"
+#endif
 
 /**
  * Provide an easy-to-use way to manipulate ESP8266. 
@@ -48,6 +52,18 @@ class ESP8266 {
      * @warning parameter baud depends on the AT firmware. 9600 is an common value. 
      */
     ESP8266(SoftwareSerial &uart, uint32_t baud = 9600);
+
+#elif defined(ESP8266_USE_ALTSOFT_SERIAL)
+    /*
+     * Constuctor. 
+     *
+     * @param uart - an reference of AltSoftSerial object. 
+     * @param baud - the buad rate to communicate with ESP8266(default:9600). 
+     *
+     * @warning parameter baud depends on the AT firmware. 9600 is an common value. 
+     */
+    ESP8266(AltSoftSerial &uart, uint32_t baud = 9600);
+
 #else /* HardwareSerial */
     /*
      * Constuctor. 
@@ -459,6 +475,8 @@ class ESP8266 {
     
 #ifdef ESP8266_USE_SOFTWARE_SERIAL
     SoftwareSerial *m_puart; /* The UART to communicate with ESP8266 */
+#elif defined(ESP8266_USE_ALTSOFT_SERIAL)
+    AltSoftSerial *m_puart; /* The UART to communicate with ESP8266 */
 #else
     HardwareSerial *m_puart; /* The UART to communicate with ESP8266 */
 #endif
diff --git a/README.md b/README.md
index 3ae5326..93a2802 100644
--- a/README.md
+++ b/README.md
@@ -116,6 +116,20 @@ After modification, it should be:
 
     #define ESP8266_USE_SOFTWARE_SERIAL
 
+# Using AltSoftSerial
+
+There is a alternative to SoftwareSerial (a.k.a NewSoftSerial).
+AltSoftSerial is particularly useful when simultaneous data flows are needed.
+https://www.pjrc.com/teensy/td_libs_AltSoftSerial.html
+
+If you want to use AltSoftSerial to communicate with ESP8266, you need to modify
+the line in file `ESP8266.h`:
+
+    //#define ESP8266_USE_ALTSOFT_SERIAL
+
+After modification, it should be:
+
+    #define ESP8266_USE_ALTSOFT_SERIAL
 
 # Hardware Connection