Callback function not called? - c++

Question

I have 2 callback functions in an Arduino file (.ino, c++):
void incomingPacket(const char* subject, const char* message){
Serial.print("subject: ");
Serial.println(subject);
Serial.print("message: ");
Serial.println(message);
}
void connectedProtocol(bool connected){
if(connected){
Serial.println("protocol server connected");
}else{
Serial.println("protocol server disconnected");
}
}
And in my Arduino file I have a custom class UDPProtocol protocol(Udp) which calls the callback functions after certain events, like:
_connectedcb(setTo); //this calls connectedProtocol callback in Arduino from UDPProtocol class
This above works fine, it calls the callback function connectedProtocol() with correct boolean value. However, when trying to call incomingPacket() callback function, nothing happens in my Arduino file. Method that calls the callback:
//this is from UDPProtocol class
void UDPProtocol::readPacketContents(char* content){
if(strlen(content)){ //if content size is greater than 0
const char* somemessage = "Hellomessage";
const char* subject;
const char* message;
subject = &somemessage[0]; //this depends on the actual format of udp packet
message = &somemessage[1];
_packetcb(subject,message);
}
_buffer[0] = 0;
}
Whenever this method runs, callback is not called in Arduino. Even if I try to fake the message like:
void UDPProtocol::readPacketContents(char* content){
if(strlen(content)){ //if content size is greater than 0
const char* somemessage = "Hellomessage";
const char* subject;
const char* message;
subject = &somemessage[0]; //this depends on the actual format of udp packet
message = &somemessage[1];
_packetcb(subject,message);
}
_buffer[0] = 0;
}
Still nothing happens (if(strlen(content)) does equal true). Any suggestions?
EDIT:
UDPProtocol.h file:
typedef void (*PackedCallback)(const char* subject, const char* message);
PackedCallback _packetcb;
UDPProtocol.cpp file:
void UDPProtocol::setPacketCallback(PackedCallback func){
this->_packetcb = func;
}
In Arduino.ino:
protocol.setPacketCallback(incomingPacket); //defined in this question above
EDIT 2:
I created a gist with the full code:
https://gist.github.com/aliamid93/64ba2ed0e06b1f9b4401474646f8083e