// TODO: This a guess!!...untested!!
public byte[] read() {
try {
serialConnection.readStaleData();
long start = currentTimeMillis();
while (currentTimeMillis() - start <= sendTimeout) {
if (serialConnection.available() > 10) {
byte[] bytes = serialConnection.readAvailable();
LOGGER.trace("AEM UEGO input: " + asHex(bytes));
int startIndex = findStart(bytes);
LOGGER.trace("AEM UEGO start index: " + startIndex);
if (startIndex < 0 || startIndex >= bytes.length) continue;
List<Byte> buffer = new ArrayList<Byte>();
for (int i = startIndex; i < bytes.length; i++) {
byte b = bytes[i];
if (b == (byte) 0x0D) {
byte[] response = toArray(buffer);
LOGGER.trace("AEM UEGO Response: " + asHex(response));
return response;
} else {
buffer.add(b);
}
}
}
sleep(1);
}
LOGGER.warn("AEM UEGO Response [read timeout]");
return new byte[0];
} catch (Exception e) {
close();
throw new SerialCommunicationException(e);
}
}
/**
* Retrieve a message through the existing communication channel from the vehicle.
*
* @param channelId - handle to the open communications channel
* @param maxWait - maximum time (in milliseconds) for read completion
* @return bytes read from the vehicle network
*/
public byte[] readMsg(int channelId, long maxWait) {
List<byte[]> responses = new ArrayList<byte[]>();
long end = currentTimeMillis() + maxWait;
do {
PASSTHRU_MSG msg = doReadMsg(channelId);
LOGGER.trace("Read Msg: " + toString(msg));
if (isResponse(msg)) responses.add(data(msg));
ThreadUtil.sleep(2);
} while (currentTimeMillis() <= end);
return concat(responses);
}
/**
* Retrieve the indicated number of messages through the existing communication channel from the
* vehicle. If the number of messages can not be read before the timeout expires, throw an
* exception.
*
* @param channelId - handle to the open communications channel
* @param numMsg - number of valid messages to retrieve
* @return bytes read from the vehicle network
* @throws J2534Exception
*/
public byte[] readMsg(int channelId, int numMsg, long timeout) {
if (loopback) {
numMsg++;
}
List<byte[]> responses = new ArrayList<byte[]>();
long end = currentTimeMillis() + timeout;
do {
if (currentTimeMillis() >= end) {
String errString =
String.format("readMsg error: timeout expired waiting for %d more message(s)", numMsg);
throw new J2534Exception(errString);
}
PASSTHRU_MSG msg = doReadMsg(channelId);
LOGGER.trace("Read Msg: " + toString(msg));
if (isResponse(msg)) {
responses.add(data(msg));
numMsg--;
}
ThreadUtil.sleep(2);
} while (numMsg != 0);
return concat(responses);
}
