ESP8266 Community Forum

I am new to the ESP8266. (I do have over 50 years of experience in hardware/software/firmware development!) I have connected my PC to an ES-01 board using the Adafruit CP2104 USB Bridge and I am using HyperTerminal to communicate with the ESP8266. While I have been able to execute many of the commands in the ESP8266 command set, I receive a response of "ERROR" when I send the AP connect command as shown below:

AT+CWJAP="OFFICE"

ERROR

Where "OFFICE" is the name of an access point with no password required.

When I send a List Available AP command, I receive the following responses:

AT+CWLAP
+CWLAP:(0,"FVS318N_1",-87,"9c:3d:cf:b6:03:7a",1,-17,0)
+CWLAP:(4,"DHB-Network",-90,"c4:b3:01:df:a1:7c",1,-9,0)
+CWLAP:(3,"DHB-Network",-90,"f0:99:bf:08:23:16",1,-24,0)
+CWLAP:(0,"OFFICE",-33,"28:c6:8e:b8:47:37",11,3,0)
+CWLAP:(0,"DEN",-68,"08:bd:43:c0:19:6d",11,-9,0)

OK

Per another post, I sent the query variation of the connect command and I received the following response:

AT+CWJAP?
No AP

OK

This tells me that I am sending a valid command. I have tried setting the mode (using the CWMODE command) to 1 and 3 with the same result!

I am at a complete loss to understand what I am doing wrong. Any help would be greatly appreciated.

After many hours of research and a lot of trial and error, I discovered that the AP password field is required even when the AP is open i.e. a password is not required for access.

The proper format of the command is:

AT+CWJAP="OFFICE" ,""