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Test program to verify an ESP8266 connected to an Uno is sending and receiving commands

docs/UnoWifiTest.ino

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+// Basic serial communication with ESP8266
+// Uses serial monitor for communication with ESP8266
+//
+//  Pins
+//  Arduino pin 2 (RX) to ESP8266 TX
+//  Arduino pin 3 (TX) to ESP8266 RX
+//  Connect GND from the Arduino UNO to GND on the ESP8266
+//  Pull ESP8266 CH_PD (Also called EN) HIGH (3.3V)
+//
+// When a command is entered in to the serial monitor on the computer 
+// the Arduino will relay it to the ESP8266
+//
+
+#include <SoftwareSerial.h>
+SoftwareSerial ESPserial(2, 3); // RX | TX Put your preferred pins here
+
+void setup() 
+{
+    Serial.begin(9600);     // communication with the host computer
+    //while (!Serial)   { ; }
+
+    // Start the software serial for communication with the ESP8266
+    ESPserial.begin(9600);  
+
+    Serial.println("");
+    Serial.println("Remember to to set Both NL & CR in the serial monitor.");
+    Serial.println("Ready");
+    Serial.println("");    
+}
+
+void loop() 
+{
+    // listen for communication from the ESP8266 and then write it to the serial monitor
+    if ( ESPserial.available() )   {  Serial.write( ESPserial.read() );  }
+
+    // listen for user input and send it to the ESP8266
+    if ( Serial.available() )       {  ESPserial.write( Serial.read() );  }
+}