RF24Udp.h

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/*
 RF24Udp.h - Arduino implementation of a uIP wrapper class.
 Copyright (c) 2014 tmrh20@gmail.com, github.com/TMRh20
 Copyright (c) 2013 Norbert Truchsess <norbert.truchsess@t-online.de>
 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/>.
 
 Updated for RF24Ethernet, TMRh20 2014-2015
 */
 
#ifndef UIPUDP_H
#define UIPUDP_H
 
#include "RF24Ethernet.h"
 
#if UIP_CONF_UDP > 0 || RF24ETHERNET_USE_UDP > 0
 
    #include <Udp.h>
 
    #define UIP_UDP_MAXDATALEN    1500
    #define UIP_UDP_PHYH_LEN      UIP_LLH_LEN + UIP_IPUDPH_LEN
    #define UIP_UDP_MAXPACKETSIZE UIP_UDP_MAXDATALEN + UIP_UDP_PHYH_LEN
 
    #if UIP_CONF_UDP > 0
typedef struct
{
    uint16_t out_pos;
    uint8_t packet_next;
    uint8_t packet_in;
    uint8_t packet_out;
    int packet_in_size;
    uint16_t in_pos;
    boolean send;
} uip_udp_userdata_t;
 
    #elif RF24ETHERNET_USE_UDP
 
struct UDPState
{
    volatile bool dataReceived = false;
};
 
static UDPState* udpState;
 
    #endif
 
class RF24UDP : public UDP
{
private:
 
    #if UIP_CONF_UDP > 0
    struct uip_udp_conn* _uip_udp_conn;
 
    uip_udp_userdata_t appdata;
    #elif RF24ETHERNET_USE_UDP
    static struct udp_pcb* udpPcb;
 
    static int8_t udpDataIn[MAX_PAYLOAD_SIZE - 14];
    static int32_t dataInPos;
    static int8_t udpDataOut[MAX_PAYLOAD_SIZE - 14];
    static int32_t dataOutPos;
 
    struct udp_send_ctx
    {
        struct udp_pcb* pcb;
        struct pbuf* p;
        ip_addr_t ip;
        u16_t port;
    };
 
    #endif
 
public:
    /** @brief Constructor */
    RF24UDP();
 
    /**
     * @brief initialize, start listening on specified port.
     * @returns 1 if successful, 0 if there are no sockets available to use
     */
    uint8_t begin(uint16_t);
 
    /** @brief Finish with the UDP socket */
    void stop();
 
    /**
     * @brief Sending UDP packets
     *
     * Start building up a packet to send to the remote host specific in ip and port
     * @return 1 if successful, 0 if there was a problem with the supplied IP address or port
     */
    int beginPacket(IPAddress ip, uint16_t port);
 
    /**
     * Start building up a packet to send to the remote host specific in host and port
     * @return 1 if successful, 0 if there was a problem resolving the hostname or port
     */
    int beginPacket(const char* host, uint16_t port);
 
    /**
     * @brief Finish off this packet and send it
     * @return 1 if the packet was sent successfully, 0 if there was an error
     */
    int endPacket();
 
    /** @brief Write a single byte into the packet */
    size_t write(uint8_t);
 
    /** @brief Write @p size bytes from @p buffer into the packet */
    size_t write(const uint8_t* buffer, size_t size);
 
    using Print::write;
 
    /**
     * Start processing the next available incoming packet
     * @return The size of the packet in bytes, or 0 if no packets are available
     */
    int parsePacket();
 
    /** Number of bytes remaining in the current packet */
    int available();
 
    /** Read a single byte from the current packet */
    int read();
 
    /**
     * Read up to @p len bytes from the current packet and place them into @p buffer
     * @return The number of bytes read, or 0 if none are available
     */
    int read(unsigned char* buffer, size_t len);
 
    /**
     * Read up to @p len characters from the current packet and place them into @p buffer
     * @return The number of characters read, or 0 if none are available
     */
    int read(char* buffer, size_t len)
    {
        return read((unsigned char*)buffer, len);
    };
 
    /** @return The next byte from the current packet without moving on to the next byte */
    int peek();
 
    /** < Finish reading the current packet  */
    void flush();
 
    /** Return the IP address of the host who sent the current incoming packet */
    IPAddress remoteIP();
 
    /** Return the port of the host who sent the current incoming packet */
    uint16_t remotePort();
 
private:
    friend void uipudp_appcall(void);
 
    friend class RF24EthernetClass;
    friend class RF24Client;
    #ifndef RF24ETHERNET_USE_UDP
    static void _send(uip_udp_userdata_t* data);
    #else
    static void _send();
    static void receiveUdp(void* arg, struct udp_pcb* pcb, struct pbuf* p, const ip_addr_t* addr, u16_t port);
    static void sendUdp(void* arg);
    #endif
};
 
#endif // UDP Enabled
#endif // UIPUDP_H