LoRa_APRS_iGate/src/digi_utils.cpp

#include <WiFi.h>
#include "configuration.h"
#include "station_utils.h"
#include "aprs_is_utils.h"
#include "query_utils.h"
#include "lora_utils.h"
#include "digi_utils.h"
#include "wifi_utils.h"
#include "gps_utils.h"
#include "display.h"
#include "utils.h"

extern Configuration    Config;
extern uint32_t         lastScreenOn;
extern String           iGateBeaconPacket;
extern String           firstLine;
extern String           secondLine;
extern String           thirdLine;
extern String           fourthLine;
extern String           fifthLine;
extern String           sixthLine;
extern String           seventhLine;


namespace DIGI_Utils {

    String generateDigiRepeatedPacket(String packet, String callsign) {
        String sender, temp0, tocall, path;
        sender = packet.substring(0,packet.indexOf(">"));
        temp0 = packet.substring(packet.indexOf(">")+1,packet.indexOf(":"));
        if (temp0.indexOf(",") > 2) {
            tocall = temp0.substring(0,temp0.indexOf(","));
            path = temp0.substring(temp0.indexOf(",")+1,temp0.indexOf(":"));
            if (path.indexOf("WIDE1-")>=0) {
                String hop = path.substring(path.indexOf("WIDE1-")+6, path.indexOf("WIDE1-")+7);
                if (hop.toInt()>=1 && hop.toInt()<=7) {
                    if (hop.toInt()==1) {
                        path.replace("WIDE1-1", callsign + "*");
                    } else {
                        path.replace("WIDE1-" + hop , callsign + "*,WIDE1-" + String(hop.toInt()-1));
                    }
                    String repeatedPacket = sender + ">" + tocall + "," + path + packet.substring(packet.indexOf(":"));
                    return repeatedPacket;
                } else {
                    return "";
                }
            } else {
                return "";
            }
        } else {
            return "";
        }
    }

    void processPacket(String packet) {
        bool queryMessage = false;
        String loraPacket, Sender, AddresseeAndMessage, Addressee, ackMessage, receivedMessage;
        if (packet != "") {
            Serial.print("Received Lora Packet   : " + String(packet));
            if (packet.substring(0, 3) == "\x3c\xff\x01") {
                Serial.println("   ---> APRS LoRa Packet");
                Sender = packet.substring(3,packet.indexOf(">"));
                STATION_Utils::updateLastHeard(Sender);
                STATION_Utils::updatePacketBuffer(packet);
                Utils::typeOfPacket(packet.substring(3), "Digi");
                AddresseeAndMessage = packet.substring(packet.indexOf("::")+2);  
                Addressee = AddresseeAndMessage.substring(0,AddresseeAndMessage.indexOf(":"));
                Addressee.trim();
                if (packet.indexOf("::") > 10 && Addressee == Config.callsign) {      // its a message for me!
                    if (AddresseeAndMessage.indexOf("{")>0) {     // ack?
                        ackMessage = "ack" + AddresseeAndMessage.substring(AddresseeAndMessage.indexOf("{")+1);
                        ackMessage.trim();
                        delay(4000);
                        //Serial.println(ackMessage);
                        for(int i = Sender.length(); i < 9; i++) {
                            Sender += ' ';
                        }
                        LoRa_Utils::sendNewPacket("APRS", Config.callsign + ">APLRG1,RFONLY,WIDE1-1::" + Sender + ":" + ackMessage);
                        receivedMessage = AddresseeAndMessage.substring(AddresseeAndMessage.indexOf(":")+1, AddresseeAndMessage.indexOf("{"));
                    } else {
                        receivedMessage = AddresseeAndMessage.substring(AddresseeAndMessage.indexOf(":")+1);
                    }
                    if (receivedMessage.indexOf("?") == 0) {
                        queryMessage = true;
                        delay(2000);
                        if (!Config.display.alwaysOn) {
                            display_toggle(true);
                        }
                        LoRa_Utils::sendNewPacket("APRS", QUERY_Utils::process(receivedMessage, Sender, "LoRa"));
                        lastScreenOn = millis();
                        show_display(firstLine, secondLine, thirdLine, fourthLine, fifthLine, "Callsign = " + Sender, "TYPE --> QUERY",  0);
                    }
                }
                if (!queryMessage && packet.indexOf("WIDE1-") > 10 && Config.digi.mode == 2) { // If should repeat packet (WIDE1 Digi)
                    loraPacket = generateDigiRepeatedPacket(packet.substring(3), Config.callsign);
                    if (loraPacket != "") {
                        delay(500);
                        Serial.println(loraPacket);
                        LoRa_Utils::sendNewPacket("APRS", loraPacket);
                        display_toggle(true);
                        lastScreenOn = millis();
                    }
                }            
            } else {
                Serial.println("   ---> LoRa Packet Ignored (first 3 bytes or NOGATE)\n");
            }
        }
    }

    void loop(String packet) {
        processPacket(packet);
    }

}