Just a pure-HTML web-interface example (for not to forget). If to call WebServer.Start - the AP will be started and you have to connect to it and open http://192.168.4.1 standard IP address of ESP-family MCU by a web-browser.
Dependings:
p.s. BTW, how better to update ClearBuffer sub for zeroing the process_global public buffer ?
p.s.2 there are many DEBUG logging due to it was hard to fix errors during web-form code debug.
module 'WebServer':
Private Sub Process_Globals
'These global variables will be declared once when the application starts.
'Public variables can be accessed from all modules.
Private bc As ByteConverter
Private aSync As AsyncStreams
Private server As WiFiServerSocket
Private DoubleCRLF(4) As Byte = Array As Byte(13, 10, 13, 10)
Private currentBuffer(1700) As Byte 'setup for your web-form
Private bufferIndex As Int ' Use index instead of lock
End Sub
Sub Start
Main.Wifi.Disconnect
Log("Starting AP: ", others.APname, "; result = ", Main.WiFi.StartAccessPoint(others.APname))
Log("My IP: ", Main.WiFi.AccessPointIp)
server.Initialize(80, "server_NewConnection")
server.Listen
ClearBuffer
End Sub
Private Sub server_NewConnection (NewSocket As WiFiSocket)
Log("Socket connected")
' Reset buffer for new connection
ClearBuffer
aSync.Initialize(NewSocket.Stream, "aSync_NewData", "aSync_Error")
End Sub
Private Sub aSync_NewData (Buffer() As Byte)
'Log("Received data chunk, length: ", Buffer.Length)
' Append new data to current buffer (like in HttpJob)
If bufferIndex + Buffer.Length > currentBuffer.Length Then
Log("Buffer is full (", Buffer.Length, ")")
SendErrorResponse("Request too large")
Return
End If
bc.ArrayCopy2(Buffer, 0, currentBuffer, bufferIndex, Buffer.Length)
bufferIndex = bufferIndex + Buffer.Length
'Log("Total buffer size: ", bufferIndex)
' Check if we have received a complete request
If IsCompleteRequest Then
Log("Complete request received, processing...")
ProcessCompleteRequest
ClearBuffer
Else
Log("Incomplete request, waiting for more data...")
End If
End Sub
Private Sub IsCompleteRequest As Boolean
If bufferIndex < 4 Then Return False
' For GET requests, look for double CRLF
If bc.IndexOf2(currentBuffer, "GET", 0) <> -1 Then
Return bc.IndexOf2(currentBuffer, DoubleCRLF, 0) <> -1
End If
' For POST requests, check Content-Length
If bc.IndexOf2(currentBuffer, "POST", 0) <> -1 Then
Dim headersEnd As Int = bc.IndexOf2(currentBuffer, DoubleCRLF, 0)
If headersEnd = -1 Then Return False
headersEnd = headersEnd + 4
' Content-Length
Dim contentLength As Int = 0
Dim clHeader() As Byte = "Content-Length: ".GetBytes
Dim clIndex As Int = bc.IndexOf2(currentBuffer, clHeader, 0)
If clIndex <> -1 Then
Dim clLineEnd As Int = bc.IndexOf2(currentBuffer, CRLF, clIndex)
If clLineEnd <> -1 Then
Dim clValueBytes() As Byte = bc.SubString2(currentBuffer, clIndex + clHeader.Length, clLineEnd)
Dim clValueStr As String = bc.StringFromBytes(bc.Trim(clValueBytes))
contentLength = clValueStr
End If
End If
Dim totalLength As Int = headersEnd + contentLength
Log("Headers end: ", headersEnd, ", Content-Length: ", contentLength, ", Expected: ", totalLength)
Return bufferIndex >= totalLength
End If
Return False
End Sub
Private Sub ProcessCompleteRequest
Log("Processing complete request, total length: ", bufferIndex)
If bc.IndexOf2(currentBuffer, "GET", 0) <> -1 Then
If bc.IndexOf2(currentBuffer, "GET / ", 0) <> -1 Or bc.IndexOf2(currentBuffer, "GET /config", 0) <> -1 Then
SendHTMLForm
Else
aSync.Write("HTTP/1.1 404 Not Found").Write(CRLF).Write(CRLF)
aSync.Write("Page not found")
End If
CallSubPlus("CloseConnection", 100, 0)
Else If bc.IndexOf2(currentBuffer, "POST", 0) <> -1 Then
ProcessFormData
CallSubPlus("CloseConnection", 100, 0)
End If
End Sub
Private Sub SendHTMLForm
aSync.Write("HTTP/1.1 200 OK").Write(CRLF)
aSync.Write("Content-Type: text/html").Write(CRLF).Write(CRLF)
aSync.Write("<!DOCTYPE html>")
aSync.Write("<html><head>")
aSync.Write("<title>WiFi Configuration</title>")
aSync.Write("<meta charset='UTF-8'>")
aSync.Write("<style>")
aSync.Write("body { font-family: Arial, sans-serif; margin: 40px; background: #f5f5f5; }")
aSync.Write(".container { background: white; padding: 30px; border-radius: 10px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); max-width: 500px; margin: 0 auto; }")
aSync.Write("h1 { color: #333; text-align: center; }")
aSync.Write(".form-group { margin-bottom: 20px; }")
aSync.Write("label { display: block; margin-bottom: 5px; font-weight: bold; color: #555; }")
aSync.Write("input[type='text'], input[type='password'] { width: 100%; padding: 10px; border: 1px solid #ddd; border-radius: 5px; box-sizing: border-box; }")
aSync.Write("input[type='submit'] { background: #007bff; color: white; padding: 12px 30px; border: none; border-radius: 5px; cursor: pointer; font-size: 16px; width: 100%; }")
aSync.Write("input[type='submit']:hover { background: #0056b3; }")
aSync.Write("</style>")
aSync.Write("</head><body>")
aSync.Write("<div class='container'>")
aSync.Write("<h1>WiFi Configuration</h1>")
aSync.Write(JoinStrings(Array As String("<h3>MCU MAC: ", Main.bc.HexFromBytes(others.MacArray), "</h3>")))
aSync.Write("<form method='POST' action='/save'>")
aSync.Write("<div class='form-group'>")
aSync.Write("<label for='ssid'>WiFi SSID <span style='color: red'>*</span>:</label>")
aSync.Write("<input type='text' id='ssid' name='ssid' placeholder='Enter WiFi network name' required maxlength='25'>")
aSync.Write("</div>")
aSync.Write("<div class='form-group'>")
aSync.Write("<label for='password'>WiFi Password:</label>")
aSync.Write("<input type='password' id='password' name='password' placeholder='Enter WiFi password' maxlength='25'>")
aSync.Write("</div>")
aSync.Write("<div class='form-group'>")
aSync.Write("<label for='api_url'>API URL <span style='color: red'>*</span>:</label>")
aSync.Write("<input type='text' id='api_url' name='api_url' placeholder='https://api.example.com/endpoint ' required maxlength='150'>")
aSync.Write("</div>")
aSync.Write("<input type='submit' value='Save'>")
aSync.Write("</form>")
aSync.Write("</div>")
aSync.Write("</body></html>")
End Sub
Private Sub ProcessFormData
Log("=== DEBUG: ProcessFormData started ===")
Dim headersEnd As Int = bc.IndexOf2(currentBuffer, DoubleCRLF, 0)
Log("DEBUG: headersEnd position: ", headersEnd)
If headersEnd = -1 Then
Log("DEBUG: ERROR - No double CRLF found")
SendErrorResponse("No form data received")
Return
End If
headersEnd = headersEnd + 4
Log("DEBUG: headersEnd after adding 4: ", headersEnd)
If headersEnd >= bufferIndex Then
Log("DEBUG: ERROR - headersEnd >= bufferIndex")
SendErrorResponse("No form data after headers")
Return
End If
If headersEnd >= currentBuffer.Length Then
Log("DEBUG: ERROR - headersEnd >= currentBuffer.Length")
SendErrorResponse("Buffer overflow")
Return
End If
Dim postData() As Byte = bc.SubString2(currentBuffer, headersEnd, bufferIndex)
Log("DEBUG: postData length: ", postData.Length)
Dim postDataString As String = bc.StringFromBytes(postData)
Log("DEBUG: Raw POST data string: ", postDataString)
Log("DEBUG: Starting parameter extraction...")
Dim ssid(), password(), api_url() As Byte
ssid = ExtractParameterBytes(postData, "ssid=")
Log("DEBUG: SSID extracted, length: ", ssid.Length)
password = ExtractParameterBytes(postData, "password=")
Log("DEBUG: Password extracted, length: ", password.Length)
api_url = ExtractParameterBytes(postData, "api_url=")
Log("DEBUG: API URL extracted, length: ", api_url.Length)
If ssid.Length = 0 Or api_url.Length = 0 Then
Log("DEBUG: ERROR - SSID or API URL is empty")
SendErrorResponse("SSID and API URL are required")
Return
End If
Log("DEBUG: Saving to GlobalStore...")
GlobalStore.Put(0, ssid)
GlobalStore.Put(1, password)
GlobalStore.Put(2, api_url)
Log("DEBUG: Calling SaveSettings...")
others.SaveSettings
Log("DEBUG: Sending success response...")
SendSuccessResponse(ssid, api_url)
Log("DEBUG: Preparing for restart...")
others.restart(2)
End Sub
Private Sub ExtractParameterBytes(Data() As Byte, paramName() As Byte) As Byte()
Log("DEBUG: ExtractParameterBytes started, paramName: ", bc.StringFromBytes(paramName))
Log("DEBUG: Data length: ", Data.Length)
Dim startIndex As Int = bc.IndexOf(Data, paramName)
Log("DEBUG: startIndex after bc.IndexOf: ", startIndex)
If startIndex = -1 Then
Log("DEBUG: Parameter not found: ", bc.StringFromBytes(paramName))
Return Array As Byte()
End If
startIndex = startIndex + paramName.Length
Log("DEBUG: startIndex after adding paramName length: ", startIndex)
If startIndex >= Data.Length Then
Log("DEBUG: ERROR - startIndex exceeds data length")
Return Array As Byte()
End If
Dim endIndex As Int = bc.IndexOf2(Data, "&", startIndex)
Log("DEBUG: endIndex after bc.IndexOf2: ", endIndex)
If endIndex = -1 Then
endIndex = Data.Length
Log("DEBUG: No & found, setting endIndex to data length: ", endIndex)
End If
If endIndex > Data.Length Then
endIndex = Data.Length
Log("DEBUG: endIndex adjusted to data length: ", endIndex)
End If
Log("DEBUG: Final indices - start: ", startIndex, ", end: ", endIndex)
If endIndex > startIndex Then
Log("DEBUG: Extracting substring...")
Dim result() As Byte = bc.SubString2(Data, startIndex, endIndex)
Log("DEBUG: Result length after substring: ", result.Length)
If result.Length = 0 Then
Log("DEBUG: Empty result after substring")
Return Array As Byte()
End If
Log("DEBUG: Before URL decode, result: ", bc.StringFromBytes(result))
Dim decoded() As Byte
Dim success As Boolean = URL.SafeURLDecode(result, decoded)
If success And decoded.Length > 0 Then
Log("DEBUG: After URL decode, decoded length: ", decoded.Length)
Log("DEBUG: Decoded content: ", bc.StringFromBytes(decoded))
Return decoded
Else
Log("DEBUG: URL decode failed or empty, returning original data")
Return result
End If
Else
Log("DEBUG: Invalid indices - endIndex <= startIndex")
Return Array As Byte()
End If
End Sub
Private Sub SendSuccessResponse(ssid() As Byte, api_url() As Byte)
aSync.Write("HTTP/1.1 200 OK").Write(CRLF)
aSync.Write("Content-Type: text/html").Write(CRLF).Write(CRLF)
aSync.Write("<html><body>")
aSync.Write("<h2>Settings saved</h2>")
aSync.Write("<p>SSID: ").Write(bc.StringFromBytes(ssid)).Write("</p>")
aSync.Write("<p>API URL: ").Write(bc.StringFromBytes(api_url)).Write("</p>")
aSync.Write("<p>Device will restart...</p>")
aSync.Write("</body></html>")
End Sub
Private Sub SendErrorResponse(message As String)
aSync.Write("HTTP/1.1 400 Bad Request").Write(CRLF)
aSync.Write("Content-Type: text/html").Write(CRLF).Write(CRLF)
aSync.Write("<html><body>")
aSync.Write("<h2>Error</h2>")
aSync.Write("<p>").Write(message).Write("</p>")
aSync.Write("</body></html>")
End Sub
Private Sub CloseConnection(u As Byte)
Log("Close AP connection")
If server.Socket.Connected Then
server.Socket.Stream.Flush
server.Socket.Close
End If
ClearBuffer
End Sub
Private Sub aSync_Error
Log("Async stream error")
ClearBuffer
server.Listen
End Sub
Sub ClearBuffer
bufferIndex = 0
' Clear buffer by setting all bytes to 0
For i = 0 To currentBuffer.Length - 1
currentBuffer(i) = 0
Next
End SubDependings:
- GlobalStore: https://www.b4x.com/android/forum/threads/module-globalstore-global-objects-storage.73863/
- The entered fields can be saved from GlobalStore to a FLASH memory by such code.
- URL.SafeURLDecode: here https://www.b4x.com/android/forum/threads/rurl-urlencode-and-urldecode.134410/post-1035351
p.s. BTW, how better to update ClearBuffer sub for zeroing the process_global public buffer ?
p.s.2 there are many DEBUG logging due to it was hard to fix errors during web-form code debug.
Last edited:
