send entropy in chunks, blink LED
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randogoth
parent
9d3d032647
commit
9504ab1032
1 changed files with 85 additions and 73 deletions
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@ -3,136 +3,148 @@
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char ssid[] = "Strix";
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char pass[] = "owl12345678";
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int led = LED_BUILTIN;
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const int led = LED_BUILTIN;
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const int rngPins[] = {A1, A2, A3, A4}; // Array of RNG pins
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const int numPins = 4;
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int status = WL_IDLE_STATUS;
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WiFiServer server(80);
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const int CHUNK_SIZE = 1000; // Adjust this value as needed
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void setup() {
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//Initialize serial and wait for port to open:
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Serial.begin(9600);
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while (!Serial) {
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; // wait for serial port to connect. Needed for native USB port only
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; // Wait for serial port to connect. Needed for native USB port only
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}
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Serial.println("Access Point Web Server");
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pinMode(led, OUTPUT); // set the LED pin mode
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pinMode(led, OUTPUT); // Set the LED pin mode
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digitalWrite(led, HIGH); // Ensure LED is off at boot
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// check for the WiFi module:
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for (int i = 0; i < numPins; i++) {
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pinMode(rngPins[i], INPUT); // Set the RNG pin modes
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}
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// Check for the WiFi module
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if (WiFi.status() == WL_NO_MODULE) {
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Serial.println("Communication with WiFi module failed!");
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// don't continue
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while (true);
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}
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// by default the local IP address will be 192.168.4.1
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// you can override it with the following:
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// WiFi.config(IPAddress(10, 0, 0, 1));
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// print the network name (SSID);
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// Print the network name (SSID)
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Serial.print("Creating access point named: ");
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Serial.println(ssid);
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// Create open network. Change this line if you want to create an WEP network:
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// Create open network
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status = WiFi.beginAP(ssid, pass);
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if (status != WL_AP_LISTENING) {
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Serial.println("Creating access point failed");
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// don't continue
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while (true);
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}
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// wait 10 seconds for connection:
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// Wait 10 seconds for connection
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delay(10000);
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// start the web server on port 80
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// Start the web server on port 80
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server.begin();
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// you're connected now, so print out the status
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// Print WiFi status
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printWiFiStatus();
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}
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void loop() {
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// compare the previous status to the current status
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if (status != WiFi.status()) {
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// it has changed update the variable
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status = WiFi.status();
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if (status == WL_AP_CONNECTED) {
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// a device has connected to the AP
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Serial.println("Device connected to AP");
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} else {
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// a device has disconnected from the AP, and we are back in listening mode
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Serial.println("Device disconnected from AP");
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}
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}
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WiFiClient client = server.available(); // listen for incoming clients
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if (client) { // if you get a client,
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digitalWrite(led, LOW);
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Serial.println("new client"); // print a message out the serial port
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String currentLine = ""; // make a String to hold incoming data from the client
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while (client.connected()) { // loop while the client's connected
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delayMicroseconds(10); // This is required for the Arduino Nano RP2040 Connect - otherwise it will loop so fast that SPI will never be served.
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if (client.available()) { // if there's bytes to read from the client,
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char c = client.read(); // read a byte, then
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Serial.write(c); // print it out to the serial monitor
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if (c == '\n') { // if the byte is a newline character
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WiFiClient client = server.available();
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if (client) {
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String request = client.readStringUntil('\r');
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client.flush();
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// if the current line is blank, you got two newline characters in a row.
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// that's the end of the client HTTP request, so send a response:
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if (currentLine.length() == 0) {
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// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
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// and a content-type so the client knows what's coming, then a blank line:
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client.println("HTTP/1.1 200 OK");
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client.println("Content-type:text/html");
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client.println();
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// Check if the request is a GET request and contains "length"
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if (request.indexOf("GET") >= 0 && request.indexOf("length=") >= 0) {
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int lengthIndex = request.indexOf("length=") + 7;
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int lengthEndIndex = request.indexOf(" ", lengthIndex);
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String lengthString = request.substring(lengthIndex, lengthEndIndex);
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int length = lengthString.toInt();
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// the content of the HTTP response follows the header:
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client.print("STRIX");
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// Send the response to the client in chunks
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client.println("HTTP/1.1 200 OK");
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client.println("Content-Type: text/plain");
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client.println("Connection: close");
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client.println();
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// The HTTP response ends with another blank line:
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client.println();
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// break out of the while loop:
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break;
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}
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else { // if you got a newline, then clear currentLine:
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currentLine = "";
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}
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}
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else if (c != '\r') { // if you got anything else but a carriage return character,
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currentLine += c; // add it to the end of the currentLine
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}
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// Check to see if the client request was "GET /H" or "GET /L":
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if (currentLine.endsWith("GET /H")) {
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;
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}
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if (currentLine.endsWith("GET /L")) {
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;
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}
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}
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sendRandomHex(client, length);
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}
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// close the connection:
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delay(1);
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client.stop();
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digitalWrite(led, HIGH);
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Serial.println("client disconnected");
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}
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}
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void sendRandomHex(WiFiClient &client, int length) {
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int bitsNeeded = length * 8;
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int byteValue[numPins] = {0};
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int bitCount = 0;
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char hexBuffer[CHUNK_SIZE * 2 + 1]; // Buffer to hold the hex representation of the chunk
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int bufferIndex = 0;
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for (int i = 0; i < bitsNeeded; i += numPins) {
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for (int j = 0; j < numPins; j++) {
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int bit = analogRead(rngPins[j]) & 1; // Read the least significant bit from each pin
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byteValue[j] = (byteValue[j] << 1) | bit;
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// Blink LED according to the bit value from A1
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if (j == 0) { // Only for A1
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digitalWrite(led, bit ? LOW : HIGH);
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}
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}
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bitCount++;
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if (bitCount == 8) {
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for (int j = 0; j < numPins; j++) {
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snprintf(hexBuffer + bufferIndex, 3, "%02X", byteValue[j]); // Convert byte to hex string
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bufferIndex += 2;
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byteValue[j] = 0;
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}
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bitCount = 0;
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}
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// Send the data in chunks to avoid memory overflow
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if (bufferIndex >= CHUNK_SIZE * 2) {
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digitalWrite(led, HIGH);
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hexBuffer[bufferIndex] = '\0';
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client.print(hexBuffer);
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bufferIndex = 0;
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}
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}
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// Ensure any remaining data is sent
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if (bufferIndex > 0) {
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digitalWrite(led, HIGH);
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hexBuffer[bufferIndex] = '\0';
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client.print(hexBuffer);
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}
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// Ensure all data is sent
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client.flush();
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}
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void printWiFiStatus() {
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// print the SSID of the network you're attached to:
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Serial.print("SSID: ");
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Serial.println(WiFi.SSID());
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// print your WiFi shield's IP address:
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IPAddress ip = WiFi.localIP();
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Serial.print("IP Address: ");
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Serial.println(ip);
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// print where to go in a browser:
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Serial.print("To see this page in action, open a browser to http://");
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Serial.println(ip);
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}
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}
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