105 lines
2.9 KiB
C++
105 lines
2.9 KiB
C++
#include "PixelBot.h"
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#include <ESP8266WiFi.h>
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#include <WiFiUdp.h>
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#include "Utilities.h"
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PixelBot::PixelBot()
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{
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memset(serverIp, '\0', 16);
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}
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PixelBot::~PixelBot()
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{
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}
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/// <summary>
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/// Listens for PixelHub beacon pings in order to determine the location of the PixelHub server.
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/// </summary>
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/// <description>
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/// Puts the details it finds into the `serverIp` and `portNumber` data members.
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/// </description>
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void PixelBot::FindServer()
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{
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Serial.print("Initialising PixelHub auto detection system - ");
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// The UDP Client for sending and recieving UDP datagrams.
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WiFiUDP UdpClient;
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byte datagramBuffer[datagramBufferSize];
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memset(datagramBuffer, '\0', datagramBufferSize); // Prefill the datagram buffer with zeros for protection later
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UdpClient.beginMulticast(WiFi.localIP(), beaconAddress, beaconPort);
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Serial.println("success!");
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Serial.println("Listening for PixelHub beacon pings.");
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while(true) {
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int datagramSize = UdpClient.parsePacket();
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if(!datagramSize) continue;
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Serial.print("Received datagram #");
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Serial.print(datagramSize);
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Serial.print(" bytes in size from ");
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Serial.print(UdpClient.remoteIP());
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Serial.print(":");
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Serial.print(UdpClient.remotePort());
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if(datagramSize > datagramBufferSize) {
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Serial.println(", but the message is larger than the datagram buffer size.");
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continue;
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}
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Serial.println(".");
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UdpClient.read(datagramBuffer, datagramSize);
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Serial.print("Content as hex: ");
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for(int i = 0; i < datagramSize; i++) {
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Serial.print(datagramBuffer[i], HEX);
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Serial.print(" ");
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}
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Serial.println();
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Serial.print("Raw content: ");
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Serial.write(datagramBuffer, datagramSize);
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Serial.println();
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Serial.print("Parsing datagram - ");
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// Parse the recieved message
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char* datagramStr = (char*)datagramBuffer;
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// Find the positions of the key characters
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//int atPos = getPosition(datagramStr, datagramSize, '@');
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//int colonPos = getPosition(datagramStr, datagramSize, ':');
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int atPos = findChar(datagramStr, '@');
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int colonPos = findChar(datagramStr, ':');
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char role[7];
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char serverPortText[7];
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memset(role, '\0', 7);
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memset(serverPortText, '\0', 7);
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strncpy(role, datagramStr, atPos);
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strncpy(serverIp, datagramStr + atPos + 1, colonPos - atPos - 1);
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strncpy(serverPortText, datagramStr + colonPos + 1, datagramSize - colonPos - 1);
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Serial.println("complete.");
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Serial.print("atPos: "); Serial.println(atPos);
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Serial.print("colonPos: "); Serial.println(colonPos);
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Serial.print("Role: "); Serial.print(role); Serial.print(" ");
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Serial.print("Remote IP: "); Serial.print(serverIp); Serial.print(" ");
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Serial.print("Port number: "); Serial.print(serverPortText);
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Serial.println();
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// If the advertiser isn't playing the role of a server, then we're not interested
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if(role != "server") continue;
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serverPort = atoi(serverPortText);
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return;
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}
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}
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