File size: 4,532 Bytes
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Copyright (c) 2015 Arduino LLC. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "BridgeUdp.h"
BridgeUDP::BridgeUDP(BridgeClass &_b) :
bridge(_b), opened(false), avail(0), buffered(0), readPos(0) {
}
/* Start BridgeUDP socket, listening at local port PORT */
uint8_t BridgeUDP::begin(uint16_t port) {
if (opened)
return 0;
uint8_t cmd[] = {'e', (uint8_t)((port >> 8) & 0xFF), (uint8_t)(port & 0xFF)};
uint8_t res[2];
bridge.transfer(cmd, 3, res, 2);
if (res[1] == 1) // Error...
return 0;
handle = res[0];
opened = true;
return 1;
}
/* Release any resources being used by this BridgeUDP instance */
void BridgeUDP::stop()
{
if (!opened)
return;
uint8_t cmd[] = {'q', handle};
bridge.transfer(cmd, 2);
opened = false;
}
int BridgeUDP::beginPacket(const char *host, uint16_t port)
{
if (!opened)
return 0;
uint8_t cmd[] = {'E', handle, (uint8_t)((port >> 8) & 0xFF), (uint8_t)(port & 0xFF)};
uint8_t res[1];
bridge.transfer(cmd, 4, (const uint8_t *)host, strlen(host), res, 1);
return res[0]; // 1=Success, 0=Error
}
int BridgeUDP::beginBroadcastPacket(uint16_t port)
{
if (!opened)
return 0;
uint8_t cmd[] = {'v', handle, (uint8_t)((port >> 8) & 0xFF), (uint8_t)(port & 0xFF)};
uint8_t res[1];
bridge.transfer(cmd, 4, res, 1);
return res[0]; // 1=Success, 0=Error
}
int BridgeUDP::beginPacket(IPAddress ip, uint16_t port)
{
if (!opened)
return 0;
String address;
address.reserve(18);
address += ip[0];
address += '.';
address += ip[1];
address += '.';
address += ip[2];
address += '.';
address += ip[3];
return beginPacket(address.c_str(), port);
}
int BridgeUDP::endPacket()
{
if (!opened)
return 0;
uint8_t cmd[] = {'H', handle};
uint8_t res[1];
bridge.transfer(cmd, 2, res, 1);
return res[0]; // 1=Success, 0=Error
}
size_t BridgeUDP::write(const uint8_t *buffer, size_t size)
{
if (!opened)
return 0;
uint8_t cmd[] = {'h', handle};
uint8_t res[1];
bridge.transfer(cmd, 2, buffer, size, res, 1);
return res[0]; // 1=Success, 0=Error
}
int BridgeUDP::parsePacket()
{
if (!opened)
return 0;
buffered = 0;
readPos = 0;
uint8_t cmd[] = {'Q', handle};
uint8_t res[3];
bridge.transfer(cmd, 2, res, 3);
if (res[0] == 0) {
// There aren't any packets available
return 0;
}
avail = (res[1] << 8) + res[2];
return 1;
}
void BridgeUDP::doBuffer() {
// If there are already char in buffer exit
if (buffered > 0)
return;
if (avail == 0)
return;
// Try to buffer up to 32 characters
readPos = 0;
uint8_t cmd[] = {'u', handle, sizeof(buffer)};
buffered = bridge.transfer(cmd, 3, buffer, sizeof(buffer));
}
int BridgeUDP::read()
{
if (!opened)
return -1;
doBuffer();
if (buffered == 0) {
return -1; // no chars available
}
buffered--;
avail--;
return buffer[readPos++];
}
int BridgeUDP::read(unsigned char* buff, size_t size)
{
if (!opened)
return -1;
size_t readed = 0;
do {
if (buffered == 0) {
doBuffer();
if (buffered == 0)
return readed;
}
buff[readed++] = buffer[readPos++];
buffered--;
avail--;
} while (readed < size);
return readed;
}
int BridgeUDP::peek()
{
if (!opened)
return -1;
doBuffer();
if (buffered == 0)
return -1; // no chars available
return buffer[readPos];
}
IPAddress BridgeUDP::remoteIP()
{
if (!opened)
return -1;
uint8_t cmd[] = {'T', handle};
uint8_t res[7];
bridge.transfer(cmd, 2, res, 7);
if (res[0] == 0)
return IPAddress(0,0,0,0);
return IPAddress(res[1], res[2], res[3], res[4]);
}
uint16_t BridgeUDP::remotePort()
{
if (!opened)
return -1;
uint8_t cmd[] = {'T', handle};
uint8_t res[7];
bridge.transfer(cmd, 2, res, 7);
if (res[0] == 0)
return 0;
return (res[5] << 8) + res[6];
}
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