// serial_gateway.pde
// This sketch can be used as a gateway between 2 RadioHead radio networks (connected by a serial line), 
// or between 
// 1 RadioHead radio network and a Unix host.
// It relays all messages received on the radio driver to the serial port 
// (using the RH_Serial driver and protocol). And it relays all messages received on the RH_Serial
// driver port to the radio driver.
// Both drivers operate in promiscuous mode and preserve all headers, so this sketch acts as 
// a transparent gateway between RH_Serial and and other RadioHead driver.
//
// By replacing RH_Serial with another RadioHead driver, this can act as a universal gateway
// between any 2 RadioHead networks.
//
// Tested with RF22 driver and RH_Serial driver. The serial port was connected to a Unix host, where the 
// serial_reliable_datagram_server.pde was built and running like this:
// tools/simBuild examples/serial/serial_reliable_datagram_server/serial_reliable_datagram_server.pde
// RH_HARDWARESERIAL_DEVICE_NAME=/dev/ttyUSB1 ./serial_reliable_datagram_server
// -*- mode: C++ -*-
// 

#include <SPI.h>
#include <RH_RF22.h>
#include <RH_Serial.h>

// Singleton instance of the radio driver
// You can use other radio drivers if you want
RH_RF22 radio;
// Singleton instance of the serial driver which relays all messages
// via Serial to another RadioHead RH_Serial driver, perhaps on a Unix host.
// You could use a different Serial if the arduino has more than 1, eg Serial1 on a Mega
RH_Serial serial(Serial);

void setup() 
{
  Serial.begin(9600);
  if (!radio.init())
    Serial.println("radio init failed");  
  radio.setPromiscuous(true);
  // Defaults after init are 434.0MHz, 0.05MHz AFC pull-in, modulation FSK_Rb2_4Fd36
  if (!serial.init())
    Serial.println("serial init failed");  
  serial.setPromiscuous(true);
}

uint8_t buf[RH_SERIAL_MAX_MESSAGE_LEN];
void loop()
{
  if (radio.available())
  {    
    uint8_t len = sizeof(buf);
    radio.recv(buf, &len);
    serial.setHeaderTo(radio.headerTo());
    serial.setHeaderFrom(radio.headerFrom());
    serial.setHeaderId(radio.headerId());
    serial.setHeaderFlags(radio.headerFlags(), 0xFF); // Must clear all flags
    serial.send(buf, len);
  }
  if (serial.available())
  {
    uint8_t len = sizeof(buf);
    serial.recv(buf, &len);
    radio.setHeaderTo(serial.headerTo());
    radio.setHeaderFrom(serial.headerFrom());
    radio.setHeaderId(serial.headerId());
    radio.setHeaderFlags(serial.headerFlags(), 0xFF); // Must clear all flags
    radio.send(buf, len);
  }
}