diff --git a/mtb-daemon.pro b/mtb-daemon.pro
index ed1f58c..ddd27f0 100644
--- a/mtb-daemon.pro
+++ b/mtb-daemon.pro
@@ -44,7 +44,7 @@ QT -= gui
 QT += core serialport network
 
 VERSION_MAJOR = 0
-VERSION_MINOR = 3
+VERSION_MINOR = 4
 
 DEFINES += "VERSION_MAJOR=$$VERSION_MAJOR" "VERSION_MINOR=$$VERSION_MINOR"
 
diff --git a/src/mtbusb/mtbusb-receive.cpp b/src/mtbusb/mtbusb-receive.cpp
index b923ab7..b2346cb 100644
--- a/src/mtbusb/mtbusb-receive.cpp
+++ b/src/mtbusb/mtbusb-receive.cpp
@@ -126,6 +126,8 @@ void MtbUsb::parseMtbUsbMessage(uint8_t command_code, const std::vector<uint8_t>
 			for (auto it = m_hist.begin(); it != m_hist.end(); ++it) {
 				if (it->cmd.get() == cmd) {
 					m_hist.erase(it);
+					if (!m_out.empty())
+						this->sendNextOut();
 					return;
 				}
 			}
@@ -194,6 +196,8 @@ void MtbUsb::parseMtbBusMessage(uint8_t module, uint8_t attempts, uint8_t comman
 				for (auto it = m_hist.begin(); it != m_hist.end(); ++it) {
 					if (it->cmd.get() == m_hist[i].cmd.get()) {
 						m_hist.erase(it);
+						if (!m_out.empty())
+							this->sendNextOut();
 						return;
 					}
 				}
diff --git a/src/mtbusb/mtbusb-send.cpp b/src/mtbusb/mtbusb-send.cpp
index b9b224e..38a1af8 100644
--- a/src/mtbusb/mtbusb-send.cpp
+++ b/src/mtbusb/mtbusb-send.cpp
@@ -42,33 +42,11 @@ void MtbUsb::send(std::unique_ptr<const Cmd> &cmd, bool bypass_m_out_emptiness)
 		log("ENQUEUE: " + cmd->msg(), LogLevel::Debug);
 		m_out.emplace_back(std::move(cmd));
 	} else {
-		if (m_lastSent.addMSecs(_OUT_TIMER_INTERVAL) > QDateTime::currentDateTime()) {
-			// Last command sent too early, still space in hist buffer ->
-			// queue & activate timer for next send
-			log("ENQUEUE: " + cmd->msg(), LogLevel::Debug);
-			m_out.emplace_back(std::move(cmd));
-			if (!m_outTimer.isActive())
-				m_outTimer.start();
-		} else {
-			write(std::move(cmd));
-		}
+		write(std::move(cmd));
 	}
 }
 
-void MtbUsb::outTimerTick() {
-	if (m_out.empty())
-		m_outTimer.stop();
-	else
-		sendNextOut();
-}
-
 void MtbUsb::sendNextOut() {
-	if (m_lastSent.addMSecs(_OUT_TIMER_INTERVAL) > QDateTime::currentDateTime()) {
-		if (!m_outTimer.isActive())
-			m_outTimer.start();
-		return;
-	}
-
 	std::unique_ptr<const Cmd> out = std::move(m_out.front());
 	log("DEQUEUE: " + out->msg(), LogLevel::Debug);
 	m_out.pop_front();
diff --git a/src/mtbusb/mtbusb.cpp b/src/mtbusb/mtbusb.cpp
index 5e080ae..0d0658f 100644
--- a/src/mtbusb/mtbusb.cpp
+++ b/src/mtbusb/mtbusb.cpp
@@ -13,8 +13,6 @@ MtbUsb::MtbUsb(QObject *parent) : QObject(parent) {
 	QObject::connect(&m_serialPort, SIGNAL(aboutToClose()), this, SLOT(spAboutToClose()));
 
 	QObject::connect(&m_histTimer, SIGNAL(timeout()), this, SLOT(histTimerTick()));
-	m_outTimer.setInterval(_OUT_TIMER_INTERVAL);
-	QObject::connect(&m_outTimer, SIGNAL(timeout()), this, SLOT(outTimerTick()));
 	QObject::connect(&m_pingTimer, SIGNAL(timeout()), this, SLOT(pingTimerTick()));
 
 	m_pingTimer.setInterval(_PING_SEND_PERIOD_MS);
@@ -27,7 +25,6 @@ void MtbUsb::log(const QString &message, const LogLevel loglevel) {
 
 void MtbUsb::spAboutToClose() {
 	m_histTimer.stop();
-	m_outTimer.stop();
 	m_pingTimer.stop();
 	while (!m_hist.empty()) {
 		m_hist.front().cmd->callError(CmdError::SerialPortClosed);
diff --git a/src/mtbusb/mtbusb.h b/src/mtbusb/mtbusb.h
index 70e4183..ec6055e 100644
--- a/src/mtbusb/mtbusb.h
+++ b/src/mtbusb/mtbusb.h
@@ -23,7 +23,6 @@ constexpr size_t _HIST_TIMEOUT = 300; // ms
 constexpr size_t _HIST_SEND_MAX = 3;
 constexpr size_t _BUF_IN_TIMEOUT = 50; // ms
 constexpr size_t _MAX_HIST_BUF_COUNT = 3;
-constexpr size_t _OUT_TIMER_INTERVAL = 20; // 20 ms
 constexpr size_t _PING_SEND_PERIOD_MS = 5000;
 
 struct EOpenError : public MtbUsbError {
@@ -119,7 +118,6 @@ private slots:
 	void spHandleError(QSerialPort::SerialPortError);
 	void spAboutToClose();
 	void histTimerTick();
-	void outTimerTick();
 	void pingTimerTick();
 
 signals:
@@ -135,7 +133,6 @@ private slots:
 	QSerialPort m_serialPort;
 	QByteArray m_readData;
 	QTimer m_histTimer;
-	QTimer m_outTimer;
 	QTimer m_pingTimer;
 	std::deque<HistoryItem> m_hist;
 	std::deque<std::unique_ptr<const Cmd>> m_out;