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EDIT: I have just tried a brand new esp8266 and the AT commands work. But on 3 others it did not. Would this be because I have uploaded code to them?

I have an esp8266 ES01, the small basic one. I am connecting to the Arduino IDE 1.8.15 via a USB module, with a soldered toggle-switch across the pins to allow it to be in flash mode or not.

I am able to successfully upload the blink code example from the arduino IDE and it works, the LED blinks. I can also send text from the esp8266 via the serial and can read it in the arduino IDE.

But I cant seem to connect to it via any AT commands "AT" or "AT+GMR". I have tried Baud 9600 and 115200 but keep getting an error message.

Any ideas what I would have to do to connect? or why there would be an error? If i try it with the switch in the opposite position it sends, but I get nothing back.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at processing.app.Serial.write(Serial.java:254)
    at processing.app.Serial.write(Serial.java:274)
    at processing.app.SerialMonitor.send(SerialMonitor.java:122)
    at processing.app.SerialMonitor.lambda$new$1(SerialMonitor.java:66)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.Component.processMouseEvent(Component.java:6539)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
    at java.awt.Component.processEvent(Component.java:6304)
    at java.awt.Container.processEvent(Container.java:2239)
    at java.awt.Component.dispatchEventImpl(Component.java:4889)
    at java.awt.Container.dispatchEventImpl(Container.java:2297)
    at java.awt.Component.dispatchEvent(Component.java:4711)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4904)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4535)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4476)
    at java.awt.Container.dispatchEventImpl(Container.java:2283)
    at java.awt.Window.dispatchEventImpl(Window.java:2746)
    at java.awt.Component.dispatchEvent(Component.java:4711)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
    at java.awt.EventQueue.access$500(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:709)
    at java.awt.EventQueue$3.run(EventQueue.java:703)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)
    at java.awt.EventQueue$4.run(EventQueue.java:733)
    at java.awt.EventQueue$4.run(EventQueue.java:731)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
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This is a bug in the Arduino IDE. I think the solution is to use a different terminal program to communicate with the ESP8266. For instance, you can use the freely available program "Putty" as described here:

ESP8266 with AT Commands – Connect from PC with PuTTY

http://flower-platform.com/2015/12/16/esp8266-with-at-commands-connect-from-pc-with-putty/

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  • \$\begingroup\$ Thanks for the reply, I have tried it in Putty but the console seems to freeze upon connection and It wont type anything on the console if I press a key. However putty works again for the ESP module that I had not yet uploaded any code too. Is it possible that uploading the code removed the AT Firmware? \$\endgroup\$
    – Ciribear
    Jun 12 at 1:14

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