//
//--tested, working--//
//bit of a misnomer. This waits to receive a packet and then stores it in a buffer
//it is important that this is called before any of the read or available commands
//are called. This does the actual work. Read, peek, etc. are just organizational.
//
int WiFiUDP::parsePacket()
{
//
//make sure we actually have a socket
//
if (_socketIndex == NO_SOCKET_AVAIL) {
return 0;
}
//
//the sl_select command blocks until something interesting happens or
//it times out (current timeout set for 10 ms, the minimum)
//
SlTimeval_t timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 10000;
int socketHandle = WiFiClass::_handleArray[_socketIndex];
SlFdSet_t readSocketHandles, errorSocketHandles;
SL_FD_ZERO(&readSocketHandles);
SL_FD_ZERO(&errorSocketHandles);
SL_FD_SET(socketHandle, &readSocketHandles);
SL_FD_SET(socketHandle, &errorSocketHandles);
int iRet = sl_Select(socketHandle+1, &readSocketHandles, NULL, &errorSocketHandles, &timeout);
if (iRet <= 0) {
return 0;
}
//
//Since we've reached this point, the sl_select command has indicated
//that either we're going to get an error, or an immediate read
//
SlSockAddrIn_t address = {0};
int AddrSize = sizeof(address);
int bytes = sl_RecvFrom(socketHandle, rx_buf, UDP_RX_PACKET_MAX_SIZE, NULL, (SlSockAddr_t*)&address, (SlSocklen_t*)&AddrSize);
//
//store the sender's address (sl_HtonX reorders bits to processor order)
//!! Although this follows some examples (upd_socket), it goes against the
//!! API documentation. The API maintains that the 5th arg to RecvFrom is not in/out
//
_remoteIP = address.sin_addr.s_addr;
_remotePort = sl_Htons(address.sin_port);
//
//If an error occured, return 0, otherwise return the byte length of the packet
//and reset the buffer index counter and fill level variables
//
if (bytes < 0) {
rx_fillLevel = 0;
return 0;
} else {
rx_currentIndex = 0;
rx_fillLevel = bytes;
return bytes;
}
}
int cc3200_write(Network* n, unsigned char* buffer, int len, int timeout_ms) {
SlTimeval_t timeVal;
SlFdSet_t fdset;
int rc = 0;
int readySock;
SL_FD_ZERO(&fdset);
SL_FD_SET(n->my_socket, &fdset);
timeVal.tv_sec = 0;
timeVal.tv_usec = timeout_ms * 1000;
do {
readySock = sl_Select(n->my_socket + 1, NULL, &fdset, NULL, &timeVal);
} while(readySock != 1);
rc = sl_Send(n->my_socket, buffer, len, 0);
return rc;
}
int cc3200_read(Network* n, unsigned char* buffer, int len, int timeout_ms) {
SlTimeval_t timeVal;
SlFdSet_t fdset;
int rc = 0;
int recvLen = 0;
SL_FD_ZERO(&fdset);
SL_FD_SET(n->my_socket, &fdset);
timeVal.tv_sec = 0;
timeVal.tv_usec = timeout_ms * 1000;
if (sl_Select(n->my_socket + 1, &fdset, NULL, NULL, &timeVal) == 1) {
do {
rc = sl_Recv(n->my_socket, buffer + recvLen, len - recvLen, 0);
recvLen += rc;
} while(recvLen < len);
}
return recvLen;
}
//--tested, working--//
//--client and server side--//
int WiFiClient::available()
{
//
//don't do anything if not properly set up
//
if (_socketIndex == NO_SOCKET_AVAIL) {
return 0;
}
//
//if the buffer doesn't have any data in it or we've read everything
//then receive some data
//
int bytesLeft = rx_fillLevel - rx_currentIndex;
if (bytesLeft <= 0) {
SlTimeval_t timeout;
memset(&timeout, 0, sizeof(SlTimeval_t));
timeout.tv_sec = 0;
timeout.tv_usec = 500;
SlFdSet_t readsds, errorsds;
SL_FD_ZERO(&readsds);
SL_FD_ZERO(&errorsds);
SL_FD_SET(WiFiClass::_handleArray[_socketIndex], &readsds);
SL_FD_SET(WiFiClass::_handleArray[_socketIndex], &errorsds);
// sl_Select(WiFiClass::_handleArray[_socketIndex] + 1, &readsds, NULL, &errorsds, &timeout);
// if(!SL_FD_ISSET(WiFiClass::_handleArray[_socketIndex], &readsds)) return 0;
//
//Receive any pending information into the buffer
//if the connection has died, call stop() to make the object aware it's dead
//
int iRet = sl_Recv(WiFiClass::_handleArray[_socketIndex], rx_buffer, TCP_RX_BUFF_MAX_SIZE, 0);
if ((iRet <= 0) && (iRet != SL_EAGAIN)) {
sl_Close(WiFiClass::_handleArray[_socketIndex]);
WiFiClass::_portArray[_socketIndex] = -1;
WiFiClass::_handleArray[_socketIndex] = -1;
WiFiClass::_typeArray[_socketIndex] = -1;
_socketIndex = NO_SOCKET_AVAIL;
memset(rx_buffer, 0, TCP_RX_BUFF_MAX_SIZE);
return 0;
}
//
//receive successful. Reset rx index pointer and set buffer fill level indicator
//(if SL_EAGAIN was received, the actual number of bytes received was zero, not -11)
//
rx_currentIndex = 0;
rx_fillLevel = (iRet != SL_EAGAIN) ? iRet : 0;
bytesLeft = rx_fillLevel - rx_currentIndex;
}
//
//limit bytes left to >= 0
//
if (bytesLeft < 0) {
bytesLeft = 0;
}
return bytesLeft;
}
