I have purchased your reader and i am trying to port the library from this url:

https://github.com/m5stack/M5Unit-UHF-RFID

To work on an arduino mega. So far i'm not having much luck. I can't even get the UHF RFID unit to print its version using getVersion in setup void much less read my tags..

I have made the following changes to the .begin void in order to accomodate it being a mega:

/*! @brief Initialize the Unit UHF_RFID.*/
void Unit_UHF_RFID::begin(HardwareSerial *serial, long baud, bool debug) {
   _debug  = debug;
   _serial = serial;
   _serial->begin(baud);
}

And then my setup void looks like this:

#include "Unit_UHF_RFID.h"

Unit_UHF_RFID uhf;

String info = "";

void setup() {
 // put your setup code here, to run once:
 Serial.begin(9600);
 Serial.println("Serial begin");

 uhf.begin(&Serial2, 115200, false);

 Serial.println("Serial begin2");

 while (1) {
   info = uhf.getVersion();
   Serial.println("Version: "+info);
   if (info != "ERROR") {
     Serial.println(info);
     break;
   }
 }
 Serial.println("Version: "+info);
 // max: 26dB
 uhf.setTxPower(2600);


}

Hope someone can help me understand why this isn't working..