added support for UDP devices, added buffer for network devices, added option for sending an initial symbol after opening a network device, added option for setting transfer latency and use default 10 ms for network device, set TCP_NODELAY for TCP device socket, flush potentially buffered input on network device when connecting

src/ebusd/bushandler.cpp

@@ -313,7 +313,7 @@ result_t BusHandler::handleSymbol()
 		break;
 
 	case bs_recvResAck:
-		timeout = m_slaveRecvTimeout;
+		timeout = m_slaveRecvTimeout+m_transferLatency;
 		break;
 
 	case bs_sendCmd:
@@ -354,12 +354,12 @@ result_t BusHandler::handleSymbol()
 	result_t result;
 	if (sending) {
 		result = m_device->send(sendSymbol);
-		if (result == RESULT_OK)
+		if (result == RESULT_OK) {
 			if (m_state == bs_ready)
-				timeout = m_busAcquireTimeout;
+				timeout = m_transferLatency+m_busAcquireTimeout;
 			else
-				timeout = SEND_TIMEOUT;
-		else {
+				timeout = m_transferLatency+SEND_TIMEOUT;
+		} else {
 			sending = false;
 			timeout = SYN_TIMEOUT;
 			if (startRequest != NULL && m_nextRequests.remove(startRequest)) {
@@ -371,7 +371,7 @@ result_t BusHandler::handleSymbol()
 
 	// receive next symbol (optionally check reception of sent symbol)
 	unsigned char recvSymbol;
-	result = m_device->recv(timeout, recvSymbol);
+	result = m_device->recv(timeout+m_transferLatency, recvSymbol);
 
 	if (!sending && result == RESULT_ERR_TIMEOUT && m_generateSynInterval > 0
 	&& timeout >= m_generateSynInterval && (m_state == bs_noSignal || m_state == bs_skip)) {

src/ebusd/bushandler.h

@@ -303,8 +303,9 @@ public:
 	 * @param answer whether to answer queries for the own master/slave address.
 	 * @param busLostRetries the number of times a send is repeated due to lost arbitration.
 	 * @param failedSendRetries the number of times a failed send is repeated (other than lost arbitration).
-	 * @param slaveRecvTimeout the maximum time in microseconds an addressed slave is expected to acknowledge.
+	 * @param transferLatency the bus transfer latency in microseconds.
 	 * @param busAcquireTimeout the maximum time in microseconds for bus acquisition.
+	 * @param slaveRecvTimeout the maximum time in microseconds an addressed slave is expected to acknowledge.
 	 * @param lockCount the number of AUTO-SYN symbols before sending is allowed after lost arbitration, or 0 for auto detection.
 	 * @param generateSyn whether to enable AUTO-SYN symbol generation.
 	 * @param pollInterval the interval in seconds in which poll messages are cycled, or 0 if disabled.
@@ -312,13 +313,13 @@ public:
 	BusHandler(Device* device, MessageMap* messages,
 			const unsigned char ownAddress, const bool answer,
 			const unsigned int busLostRetries, const unsigned int failedSendRetries,
-			const unsigned int busAcquireTimeout, const unsigned int slaveRecvTimeout,
+			const unsigned int transferLatency, const unsigned int busAcquireTimeout, const unsigned int slaveRecvTimeout,
 			const unsigned int lockCount, const bool generateSyn,
 			const unsigned int pollInterval)
 		: m_device(device), m_messages(messages),
 		  m_ownMasterAddress(ownAddress), m_ownSlaveAddress((unsigned char)(ownAddress+5)), m_answer(answer),
 		  m_busLostRetries(busLostRetries), m_failedSendRetries(failedSendRetries),
-		  m_busAcquireTimeout(busAcquireTimeout), m_slaveRecvTimeout(slaveRecvTimeout),
+		  m_transferLatency(transferLatency), m_busAcquireTimeout(busAcquireTimeout), m_slaveRecvTimeout(slaveRecvTimeout),
 		  m_masterCount(1), m_autoLockCount(lockCount==0), m_lockCount(lockCount<=3 ? 3 : lockCount), m_remainLockCount(m_autoLockCount),
 		  m_generateSynInterval(generateSyn ? SYN_TIMEOUT*getMasterNumber(ownAddress)+SYMBOL_DURATION : 0),
 		  m_pollInterval(pollInterval), m_lastReceive(0), m_lastPoll(0),
@@ -496,6 +497,9 @@ private:
 	/** the number of times a failed send is repeated (other than lost arbitration). */
 	const unsigned int m_failedSendRetries;
 
+	/** the bus transfer latency in microseconds. */
+	const unsigned int m_transferLatency;
+
 	/** the maximum time in microseconds for bus acquisition. */
 	const unsigned int m_busAcquireTimeout;
 

src/ebusd/main.cpp

@@ -65,7 +65,9 @@ static bool isDaemon = false;
 static struct options opt = {
 	"/dev/ttyUSB0", // device
 	false, // noDeviceCheck
-	false, // readonly
+	false, // readOnly
+	false, // initialSend
+	-1, // latency
 	CONFIG_PATH, // configPath
 	false, // scanConfig
 	0, // checkConfig
@@ -108,7 +110,9 @@ const char *argp_program_bug_address = ""PACKAGE_BUGREPORT"";
 static const char argpdoc[] =
 	"A daemon for communication with eBUS heating systems.";
 
-#define O_CHKCFG 1
+#define O_INISND 1
+#define O_DEVLAT (O_INISND+1)
+#define O_CHKCFG (O_DEVLAT+1)
 #define O_DMPCFG (O_CHKCFG+1)
 #define O_POLINT (O_DMPCFG+1)
 #define O_ANSWER (O_POLINT+1)
@@ -132,9 +136,11 @@ static const char argpdoc[] =
 /** the definition of the known program arguments. */
 static const struct argp_option argpoptions[] = {
 	{NULL,             0,        NULL,    0, "Device options:", 1 },
-	{"device",         'd',      "DEV",   0, "Use DEV as eBUS device (serial or ip:port) [/dev/ttyUSB0]", 0 },
+	{"device",         'd',      "DEV",   0, "Use DEV as eBUS device (serial or [udp:]ip:port) [/dev/ttyUSB0]", 0 },
 	{"nodevicecheck",  'n',      NULL,    0, "Skip serial eBUS device test", 0 },
 	{"readonly",       'r',      NULL,    0, "Only read from device, never write to it", 0 },
+	{"initsend",       O_INISND, NULL,    0, "Send an initial escape symbol after connecting device", 0 },
+	{"latency",        O_DEVLAT, "USEC",  0, "Transfer latency in us [0 for USB, 10000 for IP]", 0 },
 
 	{NULL,             0,        NULL,    0, "Message configuration options:", 2 },
 	{"configpath",     'c',      "PATH",  0, "Read CSV config files from PATH [" CONFIG_PATH "]", 0 },
@@ -209,12 +215,22 @@ error_t parse_opt(int key, char *arg, struct argp_state *state)
 		opt->noDeviceCheck = true;
 		break;
 	case 'r': // --readonly
-		opt->readonly = true;
+		opt->readOnly = true;
 		if (opt->scanConfig || opt->answer || opt->generateSyn) {
 			argp_error(state, "cannot combine readonly with scanconfig/answer/generatesyn");
 			return EINVAL;
 		}
 		break;
+	case O_INISND: // --initsend
+		opt->initialSend = true;
+		break;
+	case O_DEVLAT: // --latency
+		opt->latency = parseInt(arg, 10, 0, 200000, result);
+		if (result != RESULT_OK) {
+			argp_error(state, "invalid latency");
+			return EINVAL;
+		}
+		break;
 
 	// Message configuration options:
 	case 'c': // --configpath=/etc/ebusd
@@ -226,7 +242,7 @@ error_t parse_opt(int key, char *arg, struct argp_state *state)
 		break;
 	case 's': // --scanconfig
 		opt->scanConfig = true;
-		if (opt->readonly) {
+		if (opt->readOnly) {
 			argp_error(state, "cannot combine readonly with scanconfig/answer/generatesyn");
 			return EINVAL;
 		}
@@ -256,7 +272,7 @@ error_t parse_opt(int key, char *arg, struct argp_state *state)
 		break;
 	case O_ANSWER: // --answer
 		opt->answer = true;
-		if (opt->readonly) {
+		if (opt->readOnly) {
 			argp_error(state, "cannot combine readonly with scanconfig/answer/generatesyn");
 			return EINVAL;
 		}
@@ -298,7 +314,7 @@ error_t parse_opt(int key, char *arg, struct argp_state *state)
 		break;
 	case O_GENSYN: // --generatesyn
 		opt->generateSyn = true;
-		if (opt->readonly) {
+		if (opt->readOnly) {
 			argp_error(state, "cannot combine readonly with scanconfig/answer/generatesyn");
 			return EINVAL;
 		}
@@ -929,7 +945,7 @@ int main(int argc, char* argv[])
 		return EINVAL;
 
 	// open the device
-	Device *device = Device::create(opt.device, !opt.noDeviceCheck, opt.readonly, &logRawData);
+	Device *device = Device::create(opt.device, !opt.noDeviceCheck, opt.readOnly, opt.initialSend, &logRawData);
 	if (device == NULL) {
 		logError(lf_main, "unable to create device %s", opt.device);
 		return EINVAL;

src/ebusd/main.h

@@ -29,9 +29,11 @@
 /** A structure holding all program options. */
 struct options
 {
-	const char* device; //!< eBUS device (serial device or ip:port) [/dev/ttyUSB0]
+	const char* device; //!< eBUS device (serial device or [udp:]ip:port) [/dev/ttyUSB0]
 	bool noDeviceCheck; //!< skip serial eBUS device test
-	bool readonly; //!< read-only access to the device
+	bool readOnly; //!< read-only access to the device
+	bool initialSend; //!< send an initial escape symbol after connecting device
+	int latency; //!< transfer latency in us [0 for USB, 10000 for IP]
 
 	const char* configPath; //!< path to CSV configuration files [/etc/ebusd]
 	bool scanConfig; //!< pick configuration files matching initial scan

src/ebusd/mainloop.cpp

@@ -58,10 +58,16 @@ MainLoop::MainLoop(const struct options opt, Device *device, MessageMap* message
 		logError(lf_bus, "device %s not available", m_device->getName());
 
 	// create BusHandler
+	unsigned int latency;
+	if (opt.latency<0) {
+		latency = device->getLatency();
+	} else {
+		latency = (unsigned int)opt.latency;
+	}
 	m_busHandler = new BusHandler(m_device, m_messages,
 			m_address, opt.answer,
 			opt.acquireRetries, opt.sendRetries,
-			opt.acquireTimeout, opt.receiveTimeout,
+			latency, opt.acquireTimeout, opt.receiveTimeout,
 			opt.masterCount, opt.generateSyn,
 			opt.pollInterval);
 	m_busHandler->start("bushandler");

src/lib/ebus/device.cpp

@@ -22,13 +22,15 @@
 
 #include "device.h"
 #include "data.h"
-#include <unistd.h>
 #include <cstdlib>
 #include <cstring>
 #include <fcntl.h>
 #include <fstream>
 #include <sys/ioctl.h>
 #include <sys/file.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
 #include <errno.h>
 
 #ifdef HAVE_PPOLL
@@ -43,36 +45,45 @@ Device::~Device()
 	m_dumpRawStream.close();
 }
 
-Device* Device::create(const char* name, const bool checkDevice, const bool readonly,
+Device* Device::create(const char* name, const bool checkDevice, const bool readOnly, const bool initialSend,
 		void (*logRawFunc)(const unsigned char byte, bool received))
 {
 	if (strchr(name, '/') == NULL && strchr(name, ':') != NULL) {
-		char* dup = strdup(name);
-		char* pos = strchr(dup, ':');
+		char* in = strdup(name);
+		bool udp = false;
+		char* addrpos = in;
+		char* portpos = strchr(addrpos, ':');
+		if (portpos==addrpos+3 && (strncmp(addrpos, "tcp", 3)==0 || (udp=(strncmp(addrpos, "udp", 3)==0)))) {
+			addrpos += 4;
+			portpos = strchr(addrpos, ':');
+		}
+		if (portpos==NULL) {
+			free(in);
+			return NULL; // invalid protocol or missing port
+		}
 		result_t result = RESULT_OK;
-		unsigned int port = parseInt(pos+1, 10, 1, 65535, result);
+		unsigned int port = parseInt(portpos+1, 10, 1, 65535, result);
 		if (result!=RESULT_OK) {
-			free(dup);
+			free(in);
 			return NULL; // invalid port
 		}
 		struct sockaddr_in address;
 		memset((char*)&address, 0, sizeof(address));
-
-		*pos = 0;
-		if (inet_aton(dup, &address.sin_addr) == 0) {
-			struct hostent* h = gethostbyname(dup);
+		*portpos = 0;
+		if (inet_aton(addrpos, &address.sin_addr) == 0) {
+			struct hostent* h = gethostbyname(addrpos);
 			if (h == NULL) {
-				free(dup);
+				free(in);
 				return NULL; // invalid host
 			}
 			memcpy(&address.sin_addr, h->h_addr_list[0], h->h_length);
 		}
-		free(dup);
+		free(in);
 		address.sin_family = AF_INET;
 		address.sin_port = (in_port_t)htons((uint16_t)port);
-		return new NetworkDevice(name, address, readonly, logRawFunc);
+		return new NetworkDevice(name, address, readOnly, initialSend, logRawFunc, udp);
 	}
-	return new SerialDevice(name, checkDevice, readonly, logRawFunc);
+	return new SerialDevice(name, checkDevice, readOnly, initialSend, logRawFunc);
 }
 
 void Device::close()
@@ -99,7 +110,7 @@ result_t Device::send(const unsigned char value)
 	if (!isValid())
 		return RESULT_ERR_DEVICE;
 
-	if (m_readonly || write(m_fd, &value, 1) != 1)
+	if (m_readOnly || write(value) != 1)
 		return RESULT_ERR_SEND;
 
 	if (m_logRaw && m_logRawFunc != NULL)
@@ -113,7 +124,7 @@ result_t Device::recv(const long timeout, unsigned char& value)
 	if (!isValid())
 		return RESULT_ERR_DEVICE;
 
-	if (timeout > 0) {
+	if (!available() && timeout > 0) {
 		int ret;
 		struct timespec tdiff;
 
@@ -148,7 +159,7 @@ result_t Device::recv(const long timeout, unsigned char& value)
 	}
 
 	// directly read byte from device
-	ssize_t nbytes = read(m_fd, &value, 1);
+	ssize_t nbytes = read(value);
 	if (nbytes == 0)
 		return RESULT_ERR_EOF;
 	if (nbytes < 0)
@@ -251,6 +262,9 @@ result_t SerialDevice::open()
 	// set serial device into blocking mode
 	fcntl(m_fd, F_SETFL, fcntl(m_fd, F_GETFL) & ~O_NONBLOCK);
 
+	if (m_initialSend && write(ESC) != 1) {
+		return RESULT_ERR_SEND;
+	}
 	return RESULT_OK;
 }
 
@@ -281,17 +295,43 @@ result_t NetworkDevice::open()
 	if (m_fd != -1)
 		close();
 
-	int ret;
-
-	m_fd = socket(AF_INET, SOCK_STREAM, 0);
+	m_fd = socket(AF_INET, m_udp ? SOCK_DGRAM : SOCK_STREAM, 0);
 	if (m_fd < 0)
 		return RESULT_ERR_GENERIC_IO;
 
-	ret = connect(m_fd, (struct sockaddr*)&m_address, sizeof(m_address));
+	int ret;
+	if (m_udp) {
+		struct sockaddr_in address = m_address;
+		address.sin_addr.s_addr = INADDR_ANY;
+		ret = bind(m_fd, (struct sockaddr*)&address, sizeof(address));
+	} else {
+		int value = 1;
+		ret = setsockopt(m_fd, IPPROTO_TCP, TCP_NODELAY, (void*)&value, sizeof(value));
+	}
+	if (ret==0)	{
+		ret = connect(m_fd, (struct sockaddr*)&m_address, sizeof(m_address));
+	}
 	if (ret < 0) {
 		close();
 		return RESULT_ERR_GENERIC_IO;
 	}
+	int cnt;
+	if (ioctl(m_fd, FIONREAD, &cnt) >= 0 && cnt > 1) {
+		// skip buffered input
+		unsigned char buf[256];
+		while (::read(m_fd, &buf, 256) > 0);
+	}
+	if (m_bufSize==0) {
+		m_bufSize = MAX_LEN+1;
+		m_buffer = (unsigned char*)malloc(m_bufSize);
+		if (!m_buffer) {
+			m_bufSize = 0;
+		}
+	}
+	m_bufLen = 0;
+	if (m_initialSend && write(ESC) != 1) {
+		return RESULT_ERR_SEND;
+	}
 	return RESULT_OK;
 }
 
@@ -300,6 +340,39 @@ void NetworkDevice::checkDevice()
 	unsigned char value;
 	ssize_t c = ::recv(m_fd, &value, 1, MSG_PEEK | MSG_DONTWAIT);
 	if (c == 0 || (c < 0 && errno != EAGAIN)) {
+		m_bufLen = 0; // flush read buffer
 		close();
 	}
 }
+
+bool NetworkDevice::available()
+{
+	return m_buffer && m_bufLen>0;
+}
+
+ssize_t NetworkDevice::write(const unsigned char value)
+{
+	m_bufLen = 0; // flush read buffer
+	return Device::write(value);
+}
+
+ssize_t NetworkDevice::read(unsigned char& value)
+{
+	if (available()) {
+		value = m_buffer[m_bufPos];
+		m_bufPos = (unsigned char)((m_bufPos+1)%m_bufSize);
+		m_bufLen--;
+		return 1;
+	}
+	if (m_bufSize>0) {
+		ssize_t size = ::read(m_fd, m_buffer, m_bufSize);
+		if (size<=0) {
+			return size;
+		}
+		value = m_buffer[0];
+		m_bufPos = 1;
+		m_bufLen = (unsigned char)(size-1);
+		return size;
+	}
+	return Device::read(value);
+}

src/lib/ebus/device.h

@@ -19,6 +19,7 @@
 #ifndef LIBEBUS_DEVICE_H_
 #define LIBEBUS_DEVICE_H_
 
+#include <unistd.h>
 #include <termios.h>
 #include <iostream>
 #include <fstream>
@@ -48,12 +49,13 @@ public:
 	 * Construct a new instance.
 	 * @param name the device name (e.g. "/dev/ttyUSB0" for serial, "127.0.0.1:1234" for network).
 	 * @param checkDevice whether to regularly check the device availability (only for serial devices).
-	 * @param readonly whether to allow read access to the device only.
+	 * @param readOnly whether to allow read access to the device only.
+	 * @param initialSend whether to send an initial @a ESC symbol in @a open().
 	 * @param logRawFunc the function to call for logging raw data, or NULL.
 	 */
-	Device(const char* name, const bool checkDevice, const bool readonly,
+	Device(const char* name, const bool checkDevice, const bool readOnly, const bool initialSend,
 		void (*logRawFunc)(const unsigned char byte, bool received))
-		: m_name(name), m_checkDevice(checkDevice), m_readonly(readonly), m_fd(-1),
+		: m_name(name), m_checkDevice(checkDevice), m_readOnly(readOnly), m_initialSend(initialSend), m_fd(-1),
 		  m_logRaw(false), m_logRawFunc(logRawFunc),
 		  m_dumpRaw(false), m_dumpRawFile(NULL), m_dumpRawMaxSize(0), m_dumpRawStream(), m_dumpRawFileSize(0) {}
 
@@ -66,14 +68,21 @@ public:
 	 * Factory method for creating a new instance.
 	 * @param name the device name (e.g. "/dev/ttyUSB0" for serial, "127.0.0.1:1234" for network).
 	 * @param checkDevice whether to regularly check the device availability (only for serial devices).
-	 * @param readonly whether to allow read access to the device only.
+	 * @param readOnly whether to allow read access to the device only.
+	 * @param initialSend whether to send an initial @a ESC symbol in @a open().
 	 * @param logRawFunc the function to call for logging raw data, or NULL.
 	 * @return the new @a Device, or NULL on error.
 	 * Note: the caller needs to free the created instance.
 	 */
-	static Device* create(const char* name, const bool checkDevice=true, const bool readonly=false,
+	static Device* create(const char* name, const bool checkDevice=true, const bool readOnly=false, const bool initialSend=false,
 		void (*logRawFunc)(const unsigned char byte, bool received)=NULL);
 
+	/**
+	 * Get the transfer latency of this device.
+	 * @return the transfer latency in microseconds.
+	 */
+	virtual unsigned int getLatency() const { return 0; }
+
 	/**
 	 * Open the file descriptor.
 	 * @return the @a result_t code.
@@ -154,6 +163,26 @@ protected:
 	 */
 	virtual void checkDevice() = 0; // abstract
 
+	/**
+	 * Check whether a byte is available immediately (without waiting).
+	 * @return true when a a byte is available immediately.
+	 */
+	virtual bool available() { return false; }
+
+	/**
+	 * Write a single byte.
+	 * @param value the byte value to write.
+	 * @return the number of bytes written, or -1 on error.
+	 */
+	virtual ssize_t write(const unsigned char value) { return ::write(m_fd, &value, 1); }
+
+	/**
+	 * Read a single byte.
+	 * @param value the reference in which the read byte value is stored.
+	 * @return the number of bytes read, or -1 on error.
+	 */
+	virtual ssize_t read(unsigned char& value) { return ::read(m_fd, &value, 1); }
+
 protected:
 	/** the device name (e.g. "/dev/ttyUSB0" for serial, "127.0.0.1:1234" for network). */
 	const char* m_name;
@@ -162,7 +191,10 @@ protected:
 	const bool m_checkDevice;
 
 	/** whether to allow read access to the device only. */
-	const bool m_readonly;
+	const bool m_readOnly;
+
+	/** whether to send an initial @a ESC symbol in @a open(). */
+	const bool m_initialSend;
 
 	/** the opened file descriptor, or -1. */
 	int m_fd;
@@ -201,12 +233,13 @@ public:
 	 * Construct a new instance.
 	 * @param name the device name (e.g. "/dev/ttyUSB0" for serial, "127.0.0.1:1234" for network).
 	 * @param checkDevice whether to regularly check the device availability (only for serial devices).
-	 * @param readonly whether to allow read access to the device only.
+	 * @param readOnly whether to allow read access to the device only.
+	 * @param initialSend whether to send an initial @a ESC symbol in @a open().
 	 * @param logRawFunc the function to call for logging raw data, or NULL.
 	 */
-	SerialDevice(const char* name, const bool checkDevice, const bool readonly,
+	SerialDevice(const char* name, const bool checkDevice, const bool readOnly, const bool initialSend,
 		void (*logRawFunc)(const unsigned char byte, bool received))
-		: Device(name, checkDevice, readonly, logRawFunc) {}
+		: Device(name, checkDevice, readOnly, initialSend, logRawFunc) {}
 
 	// @copydoc
 	virtual result_t open();
@@ -234,12 +267,18 @@ public:
 	 * Construct a new instance.
 	 * @param name the device name (e.g. "/dev/ttyUSB0" for serial, "127.0.0.1:1234" for network).
 	 * @param address the socket address of the device.
-	 * @param readonly whether to allow read access to the device only.
+	 * @param readOnly whether to allow read access to the device only.
+	 * @param initialSend whether to send an initial @a ESC symbol in @a open().
 	 * @param logRawFunc the function to call for logging raw data, or NULL.
+	 * @param udp true for UDP, false to TCP.
 	 */
-	NetworkDevice(const char* name, const struct sockaddr_in address, const bool readonly,
-		void (*logRawFunc)(const unsigned char byte, bool received))
-		: Device(name, true, readonly, logRawFunc), m_address(address) {}
+	NetworkDevice(const char* name, const struct sockaddr_in address, const bool readOnly, const bool initialSend,
+		void (*logRawFunc)(const unsigned char byte, bool received), const bool udp)
+		: Device(name, true, readOnly, initialSend, logRawFunc), m_address(address), m_udp(udp),
+		  m_buffer(NULL), m_bufSize(0), m_bufLen(0), m_bufPos(0) {}
+
+	// @copydoc
+	virtual unsigned int getLatency() const { return 10000; }
 
 	// @copydoc
 	virtual result_t open();
@@ -248,10 +287,34 @@ protected:
 	// @copydoc
 	virtual void checkDevice();
 
+	// @copydoc
+	virtual bool available();
+
+	// @copydoc
+	virtual ssize_t write(const unsigned char value);
+
+	// @copydoc
+	virtual ssize_t read(unsigned char& value);
+
 private:
 	/** the socket address of the device. */
 	const struct sockaddr_in m_address;
 
+	/** true for UDP, false to TCP. */
+	const bool m_udp;
+
+	/** the buffer memory, or NULL. */
+	unsigned char* m_buffer;
+
+	/** the buffer size. */
+	unsigned char m_bufSize;
+
+	/** the buffer fill length. */
+	unsigned char m_bufLen;
+
+	/** the buffer read position. */
+	unsigned char m_bufPos;
+
 };
 
 #endif // LIBEBUS_DEVICE_H_

src/lib/ebus/test/test_device.cpp

@@ -24,7 +24,7 @@ using namespace std;
 
 int main ()
 {
-	Device* device = Device::create("/dev/ttyUSB20", true, NULL);
+	Device* device = Device::create("/dev/ttyUSB20", true, false, NULL);
 	if (device == NULL) {
 		cout << "unable to create device" << endl;
 		return -1;

src/tools/ebusfeed.cpp

@@ -129,7 +129,7 @@ int main(int argc, char* argv[])
 	if (argp_parse(&argp, argc, argv, ARGP_IN_ORDER, NULL, &opt) != 0)
 		return EINVAL;
 
-	Device* device = Device::create(opt.device, false, NULL);
+	Device* device = Device::create(opt.device, false, false, NULL);
 	if (device == NULL) {
 		cout << "unable to create device " << opt.device << endl;
 		return EINVAL;