Making a bridge for Nektar PACER

[Logawinner]

//Hello I am trying to make a bridge from element to my Nektar PACER and it's not working. Can I have a few pointers?
#include
#include
#include
#include <lo/lo.h>
#include <rtmidi/RtMidi.h>
#include

// Callback function: triggered on MIDI input
void midiCallback(double deltatime, std::vector *message, void *userData) {
// Program Change is a 2-byte message: [Status, Program Number]
if (!message || message->size() < 2) return;

unsigned char status = message->at(0);
unsigned char programNumber = message->at(1);

// FILTER: Ensure this is a Program Change message (0xC0 to 0xCF)
if ((status & 0xF0) != 0xC0) return;

lo_address element = static_cast<lo_address>(userData);

// Dynamic mapping: first detected Program Number -> next graph in list
static std::map<int, std::string> graphMapDynamic;
const std::vector<std::string> graphList = {
    "Clean Mid Verb", "Clean High Verb", "Drive Mid Verb", "Drive High Verb"
};

// Use the program number (0-127) as the key
if (graphMapDynamic.find(programNumber) == graphMapDynamic.end()) {
    size_t idx = graphMapDynamic.size() % graphList.size();
    graphMapDynamic[programNumber] = graphList[idx];
    std::cout << "Mapped Program [" << (int)programNumber << "] -> " << graphList[idx] << std::endl;
}

// Per Element documentation: command is "graphOpen" with graph name as string argument
std::string graphName = graphMapDynamic[programNumber];
std::string cmd = "graphOpen" + graphName;

// Sending to /element/command as a string
lo_send(
element,
"/element/command",
"ss",
"graphOpen",
graphName.c_str()

);

std::cout << "MIDI PC " << (int)programNumber << " -> Switched to: " << graphName << std::endl;

}

int main() {
lo_address element = lo_address_new("127.0.0.1", "24000");
if (!element) {
std::cerr << "Failed to create OSC address.\n";
return 1;
}

try {
    RtMidiIn midiin;
    unsigned int nPorts = midiin.getPortCount();
    if (nPorts == 0) {
        std::cout << "No MIDI ports available!\n";
        lo_address_free(element);
        return 0;
    }

    int pacerPort = -1;
    for (unsigned int i = 0; i < nPorts; i++) {
        std::string portName = midiin.getPortName(i);
        if (portName.find("PACER") != std::string::npos || portName.find("Pacer") != std::string::npos) {
            pacerPort = i;
        }
    }

    if (pacerPort == -1) {
        std::cerr << "Pacer not found.\n";
        lo_address_free(element);
        return 1;
    }

    midiin.openPort(pacerPort);
    midiin.setCallback(&midiCallback, element);
    
    // CRITICAL: Ignore Clock and Sensing to stop "Bridge Silence"
    midiin.ignoreTypes(true, true, true);

    std::cout << "Pacer PC Bridge Active! Press pedals to map...\n";
    std::cin.get(); 

} catch (RtMidiError &error) {
    error.printMessage();
    lo_address_free(element);
    return 1;
}

lo_address_free(element);
return 0;

}

[mfisher31]

For changing graphs with a program change you shouldn't need a custom midi handler or OSC at all. Just use the graph properties in the left side panel. For each graph set the Program number and it should "just work"

This is an old video, but still relevant for the 1.0 flavor coming out soon:
https://www.youtube.com/watch?v=jwOC7uQyoHI

[Logawinner]

Thank you