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Communication / 802.15.4:

» 802 03: Receive packets

This program shows how to receive packets with XBee-802.15.4 modules.

Required Materials

1 x Waspmote PRO
1 x Battery
1 x MiniUSB wire
2 x XBee-802.15.4 modules (emitter & receiver)

Notes

* It is necessary to set a emitter Waspmote in order to receive packets with this example. The 802_02: Send packets can be used for this purpose.

Code

/*  
 *  ------ [802_03] - receive XBee packets -------- 
 *  
 *  Explanation: This program shows how to receive packets with 
 *  XBee-802.15.4 modules.
 *  
 *  Copyright (C) 2015 Libelium Comunicaciones Distribuidas S.L. 
 *  http://www.libelium.com 
 *  
 *  This program is free software: you can redistribute it and/or modify 
 *  it under the terms of the GNU General Public License as published by 
 *  the Free Software Foundation, either version 3 of the License, or 
 *  (at your option) any later version. 
 *  
 *  This program is distributed in the hope that it will be useful, 
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of 
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 *  GNU General Public License for more details. 
 *  
 *  You should have received a copy of the GNU General Public License 
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>. 
 *  
 *  Version:           0.2
 *  Design:            David Gascón 
 *  Implementation:    Yuri Carmona
 */
 
#include <WaspXBee802.h>

// define variable
uint8_t error;


void setup()
{  
  // init USB port
  USB.ON();
  USB.println(F("Receiving example"));

  // init XBee 
  xbee802.ON();
}


void loop()
{ 
  // receive XBee packet (wait for 10 seconds)
  error = xbee802.receivePacketTimeout( 10000 );

  // check answer  
  if( error == 0 ) 
  {
    // Show data stored in '_payload' buffer indicated by '_length'
    USB.print(F("Data: "));  
    USB.println( xbee802._payload, xbee802._length);
    
    // Show data stored in '_payload' buffer indicated by '_length'
    USB.print(F("Length: "));  
    USB.println( xbee802._length,DEC);
  }
  else
  {
    // Print error message:
    /*
     * '7' : Buffer full. Not enough memory space
     * '6' : Error escaping character within payload bytes
     * '5' : Error escaping character in checksum byte
     * '4' : Checksum is not correct	  
     * '3' : Checksum byte is not available	
     * '2' : Frame Type is not valid
     * '1' : Timeout when receiving answer   
    */
    USB.print(F("Error receiving a packet:"));
    USB.println(error,DEC);     
  }
} 

Output

E#
Receiving example
Data: <=>€#387245265#node_01#0#STR:new_sensor_frame#BAT:26#
Length: 54
Data: <=>€#387245265#node_01#1#STR:new_sensor_frame#BAT:27#
Length: 54
...

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