PacketReception

Contains the Packet Reception library. This library (and entire package) was written by Meredith Hunter, so ask her if you have questions.

Packet Receiver Library

Library to receive APRS Packet.

Defines

PACKETRECEIVER_H

struct AX25Packet

#include <PacketReceiver.h>

Contains all packet information in the standard AX.25 protocol.

Public Members

std::string source: Source of packet represented as string.

int source_ssid: SSID for the source.

std::string dest: Packet destination represented as a string.

std::string msg: Message encoded by APRS packet.

class PacketReceiver

#include <PacketReceiver.h>

PacketReceiver Object for APRS.

Public Functions

PacketReceiver(int serial_num, std::string frequency, int port, std::string configfile)

Construct a new Packet Receiver object.

Parameters:

serial_num – Serial number
frequency – Desired frequency
port – TCP Port
configfile – Direwolf config file

~PacketReceiver(): Destroy the Packet Receiver object.

void startSDR(): Initializes SDR.

void startSDR(Log &m_log)

Initializes SDR so Log can track it.

Parameters:: m_log – Pointer to the Log object

void stopSDR(): Terminates SDR.

bool packetAvailable()

Checks if APRS Packet is available.

Returns:: true APRS Packet is available
Returns:: false APRS Packet is not available

AX25Packet getPacket()

Get the AX25Packet.

Returns:: The APRS Packet

Private Functions

std::string exec(std::string cmd)

Executes cmd on the command line.

Parameters:: cmd – Command line instruction
Returns:: string representing output from terminal

std::string decodeMicEComment(char *msg, int length)

Decodes Mic-E message.

Parameters:

msg – The message
length – The length of msg

Returns:

string representing the decoded message

Private Members

int serial_num: RTL-SDR serial number.

std::string frequency: Frequency to tune the SDR to.

int port_num: TCP Port for Direwolf.

std::string configfile: Name of config file for Direwolf.

std::string sdr_script = "sudo ../../runSDR.sh": Command Line instruction to run SDR script.

bool rtl_active = false: Indicates whether the radio is currently running.

int rtl_pid: Process ID for RTL_FM the last time it was started.

int count = 0: Count the number of times Direwolf has been run.

int sockfd: TCP Port info.

struct sockaddr_in serv_addr: TCP Port info server address.

struct hostent *server: TCP Port info server.

PacketTest

Simply tests if we can receive APRS Packet.

Functions

int main()

Main method to test APRS Packet Reception.

Returns:: int representing exit status

TCPTest

Tests if we can receive APRS Packet through TCP.

Functions

int main()

Main Method to test TCP Port.

Returns:: int representing exit status