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RF24Udp.cpp
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RF24Udp.cpp
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/*
RF24UDP.cpp - Arduino implementation of a uIP wrapper class.
Copyright (c) 2014 [email protected], github.com/TMRh20
Copyright (c) 2013 Norbert Truchsess <[email protected]>
All rights reserved.
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/>.
*/
#include "RF24Ethernet.h"
#if UIP_CONF_UDP > 0
#ifdef RF24ETHERNET_DEBUG_UDP
#include "HardwareSerial.h"
#endif
#if UIP_UDP
#define UIP_ARPHDRSIZE 42
#define UDPBUF ((struct uip_udpip_hdr*)&uip_buf[UIP_LLH_LEN])
/*******************************************************/
// Constructor
RF24UDP::RF24UDP() : _uip_udp_conn(NULL)
{
memset(&appdata, 0, sizeof(appdata));
}
/*******************************************************/
// initialize, start listening on specified port. Returns 1 if successful, 0 if there are no sockets available to use
uint8_t RF24UDP::begin(uint16_t port)
{
if (!_uip_udp_conn)
{
_uip_udp_conn = uip_udp_new(NULL, 0);
}
if (_uip_udp_conn)
{
uip_udp_bind(_uip_udp_conn, htons(port));
_uip_udp_conn->appstate = &appdata;
return 1;
}
return 0;
}
/*******************************************************/
// Finish with the UDP socket
void RF24UDP::stop()
{
if (_uip_udp_conn)
{
uip_udp_remove(_uip_udp_conn);
_uip_udp_conn->appstate = NULL;
_uip_udp_conn = NULL;
appdata.packet_in = 0;
appdata.packet_next = 0;
appdata.packet_out = 0;
memset(&appdata, 0, sizeof(appdata));
}
}
/*******************************************************/
// Sending UDP packets
// Start building up a packet to send to the remote host specific in ip and port
// Returns 1 if successful, 0 if there was a problem with the supplied IP address or port
int RF24UDP::beginPacket(IPAddress ip, uint16_t port)
{
RF24EthernetClass::tick();
if (ip && port)
{
uip_ipaddr_t ripaddr;
uip_ip_addr(&ripaddr, ip);
IF_RF24ETHERNET_DEBUG_UDP(Serial.print(F("RF24UDP udp beginPacket, ")););
if (_uip_udp_conn)
{
_uip_udp_conn->rport = htons(port);
uip_ipaddr_copy(_uip_udp_conn->ripaddr, &ripaddr);
}
else
{
_uip_udp_conn = uip_udp_new(&ripaddr, htons(port));
if (_uip_udp_conn)
{
IF_RF24ETHERNET_DEBUG_UDP(Serial.print(F("RF24UDP New connection, ")););
_uip_udp_conn->appstate = &appdata;
}
else
{
IF_RF24ETHERNET_DEBUG_UDP(Serial.println(F("RF24UDP Failed to allocate new connection")););
return 0;
}
}
IF_RF24ETHERNET_DEBUG_UDP(Serial.print(F("rip: ")); Serial.print(ip); Serial.print(F(", port: ")); Serial.println(port););
}
if (_uip_udp_conn)
{
if (appdata.packet_out == 0)
{
appdata.packet_out = 1;
appdata.out_pos = 0; // UIP_UDP_PHYH_LEN;
if (appdata.packet_out != 0)
{
return 1;
}
else
{
IF_RF24ETHERNET_DEBUG_UDP(Serial.println(F("RF24UDP Failed to allocate memory for packet")););
}
}
else
{
IF_RF24ETHERNET_DEBUG_UDP(Serial.println(F("RF24UDP Previous packet on that connection not sent yet")););
}
}
return 0;
}
/*******************************************************/
// Start building up a packet to send to the remote host specific in host and port
// Returns 1 if successful, 0 if there was a problem resolving the hostname or port
int RF24UDP::beginPacket(const char* host, uint16_t port)
{
// Look up the host first
int ret = 0;
DNSClient dns;
IPAddress remote_addr;
dns.begin(RF24Ethernet.dnsServerIP());
ret = dns.getHostByName(host, remote_addr);
if (ret == 1)
{
return beginPacket(remote_addr, port);
}
else
{
return ret;
}
}
/*******************************************************/
// Finish off this packet and send it
// Returns 1 if the packet was sent successfully, 0 if there was an error
int RF24UDP::endPacket()
{
if (_uip_udp_conn && appdata.packet_out != 0)
{
appdata.send = true;
IF_RF24ETHERNET_DEBUG_UDP(Serial.println(F("RF24UDP endpacket")););
uip_udp_periodic_conn(_uip_udp_conn);
if (uip_len > 0)
{
_send(&appdata);
return 1;
}
}
return 0;
}
/*******************************************************/
// Write a single byte into the packet
size_t RF24UDP::write(uint8_t c)
{
return write(&c, 1);
}
/*******************************************************/
// Write size bytes from buffer into the packet
size_t RF24UDP::write(const uint8_t* buffer, size_t size)
{
if (appdata.packet_out != 0)
{
IF_RF24ETHERNET_DEBUG_UDP(Serial.println("RF24UDP Write: "); Serial.println(size); for (int i = 0; i < size; i++) { Serial.print((char)buffer[i]); Serial.print(" "); } Serial.println(""););
size_t ret = size;
memcpy(RF24Client::all_data[0].myData + appdata.out_pos, buffer, size);
appdata.out_pos += ret;
return ret;
}
return 0;
}
/*******************************************************/
// Start processing the next available incoming packet
// Returns the size of the packet in bytes, or 0 if no packets are available
int RF24UDP::parsePacket()
{
RF24EthernetClass::tick();
int size = appdata.packet_in_size;
IF_RF24ETHERNET_DEBUG_UDP(if (appdata.packet_in != 0) { Serial.print(F("RF24UDP udp parsePacket freeing previous packet: ")); Serial.println(appdata.packet_in); });
// appdata.packet_in_size = 0;
// appdata.packet_in = appdata.packet_next;
// appdata.packet_next = 0;
IF_RF24ETHERNET_DEBUG_UDP(if (appdata.packet_in != 0) { Serial.print(F("RF24UDP udp parsePacket received packet: ")); Serial.print(appdata.packet_in); } Serial.print(F(", size: ")); Serial.println(size););
return size;
}
/*******************************************************/
// Number of bytes remaining in the current packet
int RF24UDP::available()
{
RF24EthernetClass::tick();
return appdata.packet_in_size;
}
/*******************************************************/
// Read a single byte from the current packet
int RF24UDP::read()
{
unsigned char c;
if (read(&c, 1) > 0)
{
return c;
}
return -1;
}
/*******************************************************/
// Read up to len bytes from the current packet and place them into buffer
// Returns the number of bytes read, or 0 if none are available
int RF24UDP::read(unsigned char* buffer, size_t len)
{
RF24EthernetClass::tick();
if (appdata.packet_in != 0)
{
memcpy(buffer, RF24Client::all_data[0].myData + appdata.in_pos, len);
appdata.in_pos += len;
appdata.packet_in_size -= len;
if (appdata.packet_in_size < 1)
{
appdata.packet_in = 0;
}
return len;
}
return 0;
}
/*******************************************************/
// Return the next byte from the current packet without moving on to the next byte
int RF24UDP::peek()
{
RF24EthernetClass::tick();
if (appdata.packet_in != 0)
{
return RF24Client::all_data[0].myData[appdata.in_pos];
}
return -1;
}
/*******************************************************/
// Finish reading the current packet
void RF24UDP::flush()
{
appdata.packet_in = 0;
appdata.packet_in_size = 0;
RF24EthernetClass::tick();
}
/*******************************************************/
// Return the IP address of the host who sent the current incoming packet
IPAddress RF24UDP::remoteIP()
{
return _uip_udp_conn ? ip_addr_uip(_uip_udp_conn->ripaddr) : IPAddress();
}
/*******************************************************/
// Return the port of the host who sent the current incoming packet
uint16_t RF24UDP::remotePort()
{
return _uip_udp_conn ? ntohs(_uip_udp_conn->rport) : 0;
}
/*******************************************************/
// uIP callback function
void uipudp_appcall(void)
{
if (uip_udp_userdata_t* data = (uip_udp_userdata_t*)(uip_udp_conn->appstate))
{
if (uip_newdata())
{
if (data->packet_next == 0)
{
uip_udp_conn->rport = UDPBUF->srcport;
uip_ipaddr_copy(uip_udp_conn->ripaddr, UDPBUF->srcipaddr);
// discard Linklevel and IP and udp-header and any trailing bytes:
memcpy(RF24Client::all_data[0].myData, uip_appdata, uip_len);
data->packet_in_size += uip_len;
data->packet_in = 1;
IF_RF24ETHERNET_DEBUG_UDP(Serial.print(F("RF24UDP udp, uip_newdata received packet: ")); Serial.print(data->packet_next); Serial.print(F(", size: ")); Serial.println(data->packet_in_size); for (int i = 0; i < data->packet_in_size; i++) { Serial.print(RF24Client::all_data[0].myData[i],HEX); Serial.print(F(" : ")); } Serial.println(););
}
}
if (uip_poll() && data->send)
{
// set uip_slen (uip private) by calling uip_udp_send
IF_RF24ETHERNET_DEBUG_UDP(Serial.print(F("udp, uip_poll preparing packet to send: ")); Serial.print(data->packet_out); Serial.print(F(", size: ")); Serial.println(data->out_pos););
memcpy(uip_appdata, RF24Client::all_data[0].myData, data->out_pos);
uip_udp_send(data->out_pos);
}
}
}
/*******************************************************/
void RF24UDP::_send(uip_udp_userdata_t* data)
{
#if defined(RF24_TAP)
uip_arp_out(); // add arp
#endif
if (uip_len == UIP_ARPHDRSIZE)
{
// RF24EthernetClass::uip_packet = 0;
// RF24EthernetClass::packetstate &= ~UIPETHERNET_SENDPACKET;
IF_RF24ETHERNET_DEBUG_UDP(Serial.println(F("udp, uip_poll results in ARP-packet")););
RF24EthernetClass::network_send();
}
else
{
// arp found ethaddr for ip (otherwise packet is replaced by arp-request)
data->send = false;
data->packet_out = 0;
// RF24EthernetClass::packetstate |= UIPETHERNET_SENDPACKET;
IF_RF24ETHERNET_DEBUG_UDP(Serial.println(data->out_pos); Serial.print(F("udp, uip_packet to send: ")); for (int i = 0; i < data->out_pos; i++) { Serial.print((char)RF24Client::all_data[0].myData[i]); } Serial.println(""););
RF24NetworkHeader headerOut(00, EXTERNAL_DATA_TYPE);
RF24Ethernet.network.write(headerOut, uip_buf, data->out_pos + UIP_UDP_PHYH_LEN);
}
}
/*******************************************************/
#endif // UIP_UDP
#endif // UDP Enabled