B4R Tutorial ESP8266 - WiFi Remote Configuration

Erel · Jul 3, 2016

Edit: A simpler and more powerful tool is available: https://www.b4x.com/android/forum/threads/esp-configurator-based-on-b4rserializator.81452/

The attached project allows the user to configure the ESP8266 WiFi settings (SSID and password).

When the program starts it does several things:
1. Creates an access point named 'esp'.
2. Creates a WiFiServerSocket that listens on port 80.
3. Tries to connect to a network based on the last settings stored in the EEPROM (if such are available).

The ip address of the device in the esp network is known. It is 192.168.4.1.
This means that we can connect to the esp network and then access the board with this ip address from any browser.

The server accepts two requests:
http://192.168.4.1 - Shows the current status
http://192.168.4.1/set/<ssid>/<password> - Sets the new ssid and password. Note that the password is optional.

Examples:

http://192.168.4.1/set/dlink
http://192.168.4.1/set/iPhone (2)/12345678

The SSID and password are stored in the EEPROM so the values are kept after a restart.

Note that the #StackBufferSize attribute is set to 600 as the string related methods require a larger stack buffer.

Erel · Nov 27, 2016

Are you sure that the PC is connected to the esp network?

positrom2 · Nov 27, 2016

The PC not (it is on LAN), but therefore I tried with the android smartphone, connected to the esp network and calling that address.

Erel · Nov 27, 2016

Do you see anything in the logs?

Note that Android can switch the networks automatically when it sees that there is no internet connection.

positrom2 · Nov 27, 2016

After connecting with the Android to the esp and calling that address I get this B4R log, the Android saying "not connected" despite being connected to esp Wlan.
(Can't copy the text because of the junk characters.)

Erel · Nov 27, 2016

Try to open the "set" page in the browser:
http://192.168.4.1/set/<ssid>/<password>

positrom2 · Nov 27, 2016

Yes, that works. On Android: Password etc had been set and then new page: "connected to network", "ESP8255 IP address: 192....
Thank you very much.

Bladimir Carrillo · Jan 30, 2017

Hi all,
I am testing the provided code but have a problem when parse a large parameter on browser, the buffer received is not complete on Astream_NewData sub.
This is the url containing parsed paramter ....

http://192.168.4.1/set/Claro_NETWOR...1042/0/0/0/0/1/0/0/0/0/0/1/2/3/4/5/6/7/8/9/10

The uncomplete text parsed is ...
Claro_NETWORKSSID000012345/3915852319442/192/168/0/3/51042/0/0/0/0/1/0/0/0/0/0/1/2/3/4/5/6/7

Any idea ?

Erel · Jan 30, 2017

Change the code to:

B4X:

AStream.Initialize(...)
AStream.WaitForMoreDataDelay = 100
Astream.MaxBufferSize = 200

Bladimir Carrillo · Jan 30, 2017

Erel said:
Change the code to:

B4X:

AStream.Initialize(...) AStream.WaitForMoreDataDelay = 100 Astream.MaxBufferSize = 200

Great, thank you very much.

Bladimir Carrillo · Jan 30, 2017

Erel said:
Change the code to:

B4X:

AStream.Initialize(...) AStream.WaitForMoreDataDelay = 100 Astream.MaxBufferSize = 200

An error appears on line ...

B4X:

Astream.MaxBufferSize = 200

Error:
Unknown member: maxbuffersize

inakigarm · Jan 31, 2017

Have you upgraded B4R to 1.80 version?

New features and improvements:
AsyncStream.MaxBufferSize field. Allows changing the size limit of the internal buffer.

https://www.b4x.com/android/forum/threads/b4r-v1-80-is-available-for-download.75629/#content

Bladimir Carrillo · Jan 31, 2017

inakigarm said:
Have you upgraded B4R to 1.80 versión?

Thanks Erel, I was working with versión 1.50

Peter Simpson · Mar 1, 2017

This is absolutely brilliant @Erel, I've been trying to create my own version of this all day on my ESP8266 devices, then I came across this post. Your solution worked 'First Time of asking' with ease. I tested it on all my mobile devices and laptops, it just works seamlessly, and setting up the network is a breeze through the browsers.

Cheers, you have once again saved us all plenty of time with an absolutely great solution.

I do have one question though. Ever since writing to the EEPROM on 2 of my ESP8266 devices, I now have to add a delay of around 2 seconds just under 'Serial1.Initialize(115200)'. I take it that writing to the EEPROM somehow causes something to happen speed wise for a second or two at first boot. I mean nothing serious, maybe because it reading the EEPROM. But without the delay it will miss the start of the program.

It really does not matter though, as adding the 2 second delay remedies the situation, I was just wondering why it happens though?

Thank you again

Erel · Mar 1, 2017

Peter Simpson said:
I do have one question though. Ever since writing to the EEPROM on 2 of my ESP8266 devices, I now have to add a delay of around 2 seconds just under 'Serial1.Initialize(115200)'.

I'm not familiar with such issue. What exactly happens if there is no delay?

pappicio · Jun 16, 2017

Hi all,with example on page 1, I've coded a home automation relays with a wemos mini, and configured also remote access by username and password. the problem now is:
by using GET, all works well, but username and password are visible in web page title, while, using POST, the http buffer is truncated and cannot see in header username and password to process them, but, if I configure also:
Astream.WaitForMoreDataDelay = 500
Astream.MaxBufferSize = 512

the I can see complete http POST header

B4X:

Private Sub Server_NewConnection (NewSocket As WiFiSocket)
   Astream.Initialize(NewSocket.Stream, "astream_NewData", "astream_Error")
   'configure them only with POST Connections
   Astream.WaitForMoreDataDelay = 500
   Astream.MaxBufferSize = 512
End Sub

but in this way, when call by webpage the POST, the esp8266 restart, with error (3), and sometime with error (9) or erro (2), there is other way to obtain all header chars, without use:
Astream.WaitForMoreDataDelay = 500
Astream.MaxBufferSize = 512

becouse all seems to work well, but only with GET, cos HTTP buffer header is shorter.
thanks a lot.

pappicio · Jun 16, 2017

pappicio said:
Hi all,with example on page 1, I've coded a home automation relays with a wemos mini, and configured also remote access by username and password. the problem now is:
by using GET, all works well, but username and password are visible in web page title, while, using POST, the http buffer is truncated and cannot see in header username and password to process them, but, if I configure also:
Astream.WaitForMoreDataDelay = 500
Astream.MaxBufferSize = 512

the I can see complete http POST header

B4X:

Private Sub Server_NewConnection (NewSocket As WiFiSocket) Astream.Initialize(NewSocket.Stream, "astream_NewData", "astream_Error") 'configure them only with POST Connections Astream.WaitForMoreDataDelay = 500 Astream.MaxBufferSize = 512 End Sub

but in this way, when call by webpage the POST, the esp8266 restart, with error (3), and sometime with error (9) or erro (2), there is other way to obtain all header chars, without use:
Astream.WaitForMoreDataDelay = 500
Astream.MaxBufferSize = 512

becouse all seems to work well, but only with GET, cos HTTP buffer header is shorter.
thanks a lot.

okok, solved with POST in http header, so now no more visible userame and password, thanks a lot!

rbghongade · Jun 29, 2017

Dear friends,
Is it possible to store the IP address and port number of a server running mqtt broker service in EEPROM via the same method? i.e; accessing the esp through browser.
regards,

Cableguy · Jun 29, 2017

Possible? Yes... And taking this particular example as a starting point I'm sure you will figure out how to do it!

Erel · Jun 30, 2017

You can use B4RSerializator to convert the ip and port number to an array of bytes and then write it to the EEPROM.

rbghongade · Jul 6, 2017

Dear friends,
Tried but not able to succeed. Can anyone please post a code snippet for configuring mqtt server ip and port number via browser?

B4R Tutorial ESP8266 - WiFi Remote Configuration

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