src/fsfw/osal/common/TcpTmTcServer.cpp

@@ -30,8 +30,8 @@ const std::string TcpTmTcServer::DEFAULT_SERVER_PORT = tcpip::DEFAULT_SERVER_POR
 
 TcpTmTcServer::TcpTmTcServer(object_id_t objectId, object_id_t tmtcTcpBridge,
         size_t receptionBufferSize, std::string customTcpServerPort):
-                SystemObject(objectId), tmtcBridgeId(tmtcTcpBridge),
-                tcpPort(customTcpServerPort), receptionBuffer(receptionBufferSize) {
+        SystemObject(objectId), tmtcBridgeId(tmtcTcpBridge),
+        tcpPort(customTcpServerPort), receptionBuffer(receptionBufferSize) {
     if(tcpPort == "") {
         tcpPort = DEFAULT_SERVER_PORT;
     }
@@ -127,7 +127,7 @@ ReturnValue_t TcpTmTcServer::performOperation(uint8_t opCode) {
         handleServerOperation(connSocket);
 
         // Done, shut down connection and go back to listening for client requests
-        retval = shutdown(connSocket, SHUT_SEND);
+        retval = shutdown(connSocket, SHUT_BOTH);
         if(retval != 0) {
             handleError(Protocol::TCP, ErrorSources::SHUTDOWN_CALL);
         }
@@ -163,8 +163,8 @@ void TcpTmTcServer::handleServerOperation(socket_t connSocket) {
     FD_SET(connSocket, &efds);
 
     timeval tv;
-    tv.tv_sec = 1;
-    tv.tv_usec = 0;
+    tv.tv_sec = selectTimeoutMs / 1000;
+    tv.tv_usec = (selectTimeoutMs % 1000) * 1000;
 
     int nfds = connSocket + 1;
 
@@ -192,11 +192,19 @@ void TcpTmTcServer::handleServerOperation(socket_t connSocket) {
         uint32_t index = 0;
         int retval = select(nfds, &rfds, nullptr, &efds, &tv);
         if(retval < 0) {
-            // client might have shut down connection?
+            // client might have shut down connection
+            return;
         }
         else if(retval > 0) {
             if(FD_ISSET(connSocket, &rfds)) {
                 // data available
+                int retval = recv(
+                        connSocket,
+                        reinterpret_cast<char*>(receptionBuffer.data()),
+                        receptionBuffer.capacity(),
+                        tcpFlags
+                );
+                handleTcReception(retval);
                 //int result = receiveData();
                 //if(result == 0) {
                 //  break;
@@ -207,8 +215,9 @@ void TcpTmTcServer::handleServerOperation(socket_t connSocket) {
             }
         }
         else {
-            // no data available
-            TaskFactory::delayTask(500);
+            // no data available. Send back telemetry now
+            handleTmSending(connSocket);
+            //TaskFactory::delayTask(500);
         }
     }
 }

src/fsfw/osal/common/TcpTmTcServer.h

@@ -45,6 +45,7 @@ public:
     static const std::string DEFAULT_SERVER_PORT;
 
     static constexpr size_t ETHERNET_MTU_SIZE = 1500;
+    static constexpr uint32_t DEFAULT_SELECT_TIMEOUT_MS = 200;
 
     /**
      * TCP Server Constructor
@@ -59,6 +60,7 @@ public:
             std::string customTcpServerPort = "");
     virtual~ TcpTmTcServer();
 
+    void setSelectTimeout(uint32_t timeout);
     void setTcpBacklog(uint8_t tcpBacklog);
 
     ReturnValue_t initialize() override;
@@ -77,6 +79,7 @@ private:
 
     std::string tcpPort;
     int tcpFlags = 0;
+    uint32_t selectTimeoutMs = DEFAULT_SELECT_TIMEOUT_MS;
     socket_t listenerTcpSocket = 0;
     struct sockaddr tcpAddress;
     MessageQueueId_t targetTcDestination = MessageQueueIF::NO_QUEUE;

src/fsfw/tmtcservices/PusParser.cpp

@@ -0,0 +1,141 @@
+#include "PusParser.h"
+#include <fsfw/serviceinterface/ServiceInterface.h>
+
+PusParser::PusParser(uint16_t maxExpectedPusPackets,
+		bool storeSplitPackets): indexSizePairFIFO(maxExpectedPusPackets) {
+}
+
+ReturnValue_t PusParser::parsePusPackets(const uint8_t *frame,
+		size_t frameSize) {
+	if(frame == nullptr or frameSize < 5) {
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+		sif::error << "PusParser::parsePusPackets: Frame invalid!" << std::endl;
+#else
+		sif::printError("PusParser::parsePusPackets: Frame invalid!\n");
+#endif
+		return HasReturnvaluesIF::RETURN_FAILED;
+	}
+
+	if(indexSizePairFIFO.full()) {
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+		sif::error << "PusParser::parsePusPackets: FIFO is full!" << std::endl;
+#else
+		sif::printError("PusParser::parsePusPackets: FIFO is full!\n");
+#endif
+		return HasReturnvaluesIF::RETURN_FAILED;
+	}
+
+	size_t lengthField = frame[4] << 8 | frame[5];
+
+	if(lengthField == 0) {
+		return NO_PACKET_FOUND;
+	}
+
+	size_t packetSize = lengthField + 7;
+	// sif::debug << frameSize << std::endl;
+	// Size of a pus packet is the value in the packet length field plus 7.
+	if(packetSize > frameSize) {
+		if(storeSplitPackets) {
+			indexSizePairFIFO.insert(indexSizePair(0, frameSize));
+		}
+		else {
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+			sif::debug << "TcSerialPollingTask::readNextPacket: Next packet "
+					<< "larger than remaining frame," << std::endl;
+			sif::debug << "Throwing away packet. Detected packet size: "
+					<< packetSize << std::endl;
+#else
+			sif::printDebug("TcSerialPollingTask::readNextPacket: Next packet "
+                    "larger than remaining frame.\n");
+            sif::printDebug("Throwing away packet. Detected packet size: %lu",
+                    static_cast<unsigned long>(packetSize));
+#endif
+		}
+		return SPLIT_PACKET;
+	}
+	else {
+		indexSizePairFIFO.insert(indexSizePair(0, packetSize));
+		if(packetSize == frameSize) {
+			return HasReturnvaluesIF::RETURN_OK;
+		}
+	}
+
+	// packet size is smaller than frame size, parse for more packets.
+	return readMultiplePackets(frame, frameSize, packetSize);
+}
+
+ReturnValue_t PusParser::readMultiplePackets(const uint8_t *frame,
+		size_t frameSize, size_t startIndex) {
+	while (startIndex < frameSize) {
+		ReturnValue_t result = readNextPacket(frame, frameSize, startIndex);
+		if(result != HasReturnvaluesIF::RETURN_OK) {
+			return result;
+		}
+	}
+	return HasReturnvaluesIF::RETURN_OK;
+}
+
+DynamicFIFO<PusParser::indexSizePair>* PusParser::fifo(){
+	return &indexSizePairFIFO;
+}
+
+PusParser::indexSizePair PusParser::getNextFifoPair() {
+	indexSizePair nextIndexSizePair;
+	indexSizePairFIFO.retrieve(&nextIndexSizePair);
+	return nextIndexSizePair;
+}
+
+ReturnValue_t PusParser::readNextPacket(const uint8_t *frame,
+		size_t frameSize, size_t& currentIndex) {
+	// sif::debug << startIndex << std::endl;
+    if(currentIndex + 5 > frameSize) {
+        currentIndex = frameSize;
+        return HasReturnvaluesIF::RETURN_OK;
+    }
+
+	uint16_t lengthField = frame[currentIndex + 4] << 8 |
+			frame[currentIndex + 5];
+	if(lengthField == 0) {
+		// It is assumed that no packet follows.
+		currentIndex = frameSize;
+		return HasReturnvaluesIF::RETURN_OK;
+	}
+	size_t nextPacketSize = lengthField + 7;
+	size_t remainingSize = frameSize - currentIndex;
+	if(nextPacketSize > remainingSize)
+	{
+		if(storeSplitPackets) {
+			indexSizePairFIFO.insert(indexSizePair(currentIndex, remainingSize));
+		}
+		else {
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+			sif::debug << "TcSerialPollingTask::readNextPacket: Next packet "
+					<< "larger than remaining frame." << std::endl;
+			sif::debug << "Throwing away packet. Detected packet size: "
+					<< nextPacketSize << std::endl;
+#else
+			sif::printDebug("TcSerialPollingTask::readNextPacket: Next packet "
+                    "larger than remaining frame.\n");
+			sif::printDebug("Throwing away packet. Detected packet size: %lu\n",
+			        static_cast<unsigned long>(nextPacketSize));
+#endif
+		}
+		return SPLIT_PACKET;
+	}
+
+	ReturnValue_t result = indexSizePairFIFO.insert(indexSizePair(currentIndex,
+			nextPacketSize));
+	if (result != HasReturnvaluesIF::RETURN_OK) {
+		// FIFO full.
+#if FSFW_CPP_OSTREAM_ENABLED == 1
+		sif::debug << "PusParser: Issue inserting into start index size "
+		        << "FIFO, it is full!" << std::endl;
+#else
+		sif::printDebug("PusParser: Issue inserting into start index size "
+                "FIFO, it is full!\n");
+#endif
+	}
+	currentIndex += nextPacketSize;
+
+	return result;
+}

src/fsfw/tmtcservices/PusParser.h

@@ -0,0 +1,83 @@
+#ifndef FRAMEWORK_TMTCSERVICES_PUSPARSER_H_
+#define FRAMEWORK_TMTCSERVICES_PUSPARSER_H_
+
+#include <fsfw/container/DynamicFIFO.h>
+#include <utility>
+#include <cstdint>
+
+/**
+ * @brief	This small helper class scans a given buffer for PUS packets.
+ * 			Can be used if PUS packets are serialized in a tightly packed frame.
+ * @details
+ * The parser uses the payload length field of PUS packets to find
+ * the respective PUS packet sizes.
+ *
+ * The parser parses a buffer by taking a pointer and the maximum size to scan.
+ * If PUS packets are found, they are stored in a FIFO which stores pairs
+ * consisting of the index in the buffer and the respective packet sizes.
+ *
+ * If the parser detects split packets (which means that the size of the
+ * next packet is larger than the remaining size to scan), it can either
+ * store that split packet or throw away the packet.
+ * @author   R. Mueller
+ */
+class PusParser {
+public:
+	//! The first entry is the index inside the buffer while the second index
+	//! is the size of the PUS packet starting at that index.
+	using indexSizePair = std::pair<size_t, size_t>;
+
+	static constexpr uint8_t INTERFACE_ID = CLASS_ID::PUS_PARSER;
+	static constexpr ReturnValue_t NO_PACKET_FOUND = MAKE_RETURN_CODE(0x00);
+	static constexpr ReturnValue_t SPLIT_PACKET = MAKE_RETURN_CODE(0x01);
+	/**
+	 * Parser constructor.
+	 * @param maxExpectedPusPackets
+	 * Maximum expected number of PUS packets. A good estimate is to divide
+	 * the frame size by the minimum size of a PUS packet (12 bytes)
+	 * @param storeSplitPackets
+	 * Specifies whether split packets are also stored inside the FIFO,
+	 * with the size being the remaining frame size.
+	 */
+	PusParser(uint16_t maxExpectedPusPackets, bool storeSplitPackets);
+
+	/**
+	 * Parse a given frame for PUS packets
+	 * @param frame
+	 * @param frameSize
+	 * @return -@c NO_PACKET_FOUND if no packet was found.
+	 */
+	ReturnValue_t parsePusPackets(const uint8_t* frame, size_t frameSize);
+
+	/**
+	 * Accessor function to get a reference to the internal FIFO which
+	 * stores pairs of indexi and packet sizes. This FIFO is filled
+	 * by the parsePusPackets() function.
+	 * @return
+	 */
+	DynamicFIFO<indexSizePair>* fifo();
+
+	/**
+	 * Retrieve the next index and packet size pair from the FIFO.
+	 * This also removed it from the FIFO. Please note that if the FIFO
+	 * is empty, an empty pair will be returned.
+	 * @return
+	 */
+	indexSizePair getNextFifoPair();
+
+private:
+	/** A FIFO is used to store information about multiple PUS packets
+	 * inside the receive buffer. The maximum number of entries is defined
+	 * by the first constructor argument.
+	 */
+	DynamicFIFO<indexSizePair> indexSizePairFIFO;
+
+	bool storeSplitPackets = false;
+
+	ReturnValue_t readMultiplePackets(const uint8_t *frame, size_t frameSize,
+			size_t startIndex);
+	ReturnValue_t readNextPacket(const uint8_t *frame,
+			size_t frameSize, size_t& startIndex);
+};
+
+#endif /* FRAMEWORK_TMTCSERVICES_PUSPARSER_H_ */