Receiving Code :
#define RXp2 16
#define TXp2 17
void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
Serial2.begin (SERIAL_8N1, RXp2,TXp2);
}
void loop() {
Serial.println("Message Received: ");
Serial.println(Serial2.readString());

}

Sending Code:

void setup ...