bool ReadSingleSensor::Response::match(DataBuffer& data) { const uint16 TOTAL_BYTES = 5; //if there aren't enough bytes in the buffer to match the response if(data.bytesRemaining() < TOTAL_BYTES) { //not a good response m_success = false; return false; } //create a save point with the data ReadBufferSavePoint savePoint(&data); //verify the command id if(data.read_uint8() != 0x03) { //not a good response m_success = false; return false; } uint16 sensorVal = data.read_uint16(); ChecksumBuilder checksum; checksum.append_uint16(sensorVal); //value of the requested channel //verify the checksum (only a checksum on the actual data value) if(checksum.simpleChecksum() != data.read_uint16()) { //not a good response m_success = false; return false; } //if we made it this far, the bytes match the expected response m_success = true; m_sensorValue = sensorVal; //commit the current read position savePoint.commit(); //we have fully matched the response m_fullyMatched = true; //notify that the response was matched m_matchCondition.notify(); return true; }
Bytes buildBaseReadEepromResponseV1(uint16 valueRead) { ChecksumBuilder checksum; checksum.append_uint16(valueRead); //build success response Bytes bytes; bytes.push_back(0x72); bytes.push_back(Utils::msb(valueRead)); bytes.push_back(Utils::lsb(valueRead)); return bytes; }
WirelessParser::ParsePacketResult WirelessParser::parseAsPacket_ASPP_v2(DataBuffer& data, WirelessPacket& packet, WirelessTypes::Frequency freq) { //Assume we are at the start of the packet, read the packet header //byte 1 - Start Of Packet //byte 2 - Delivery Stop Flag //byte 3 - App Data Type //byte 4 - 7 - Node Address (uint32) //byte 8 - 9 - Payload Length //byte 10 to N-4 - Payload //byte N-3 - Node RSSI //byte N-2 - Base RSSI //byte N-1 - Fletcher Checksum (MSB) //byte N - Fletcher Checksum (LSB) //create a save point for the DataBuffer ReadBufferSavePoint savePoint(&data); std::size_t totalBytesAvailable = data.bytesRemaining(); //we need at least 13 bytes for any ASPP v2 packet (if empty payload) if(totalBytesAvailable < 13) { //Not Enough Data to tell if valid packet return parsePacketResult_notEnoughData; } //read byte 1 uint8 startOfPacket = data.read_uint8(); //Start Of Packet //verify that the first byte is the Start Of Packet if(startOfPacket != WirelessPacket::ASPP_V2_START_OF_PACKET_BYTE) { //Invalid Packet return parsePacketResult_invalidPacket; } //read byte 2 uint8 deliveryStopFlag = data.read_uint8(); //Delivery Stop Flag //read byte 3 uint8 appDataType = data.read_uint8(); //App Data Type //read bytes 4 - 7 uint32 nodeAddress = data.read_uint32(); //Node Address //read bytes 8 and 9 uint16 payloadLength = data.read_uint16(); //Payload Length //determine the full packet length size_t packetLength = payloadLength + WirelessPacket::ASPP_V2_NUM_BYTES_BEFORE_PAYLOAD + WirelessPacket::ASPP_V2_NUM_BYTES_AFTER_PAYLOAD; //the DataBuffer must be large enough to hold the rest of the packet if(totalBytesAvailable < packetLength) { //Not Enough Data to tell if valid packet return parsePacketResult_notEnoughData; } //create the Bytes vector to hold the payload bytes Bytes payload; payload.reserve(payloadLength); //loop through the payload for(uint16 payloadItr = 0; payloadItr < payloadLength; payloadItr++) { //store the payload bytes payload.push_back(data.read_uint8()); //Payload Bytes } //read the node RSSI uint8 nodeRSSI = data.read_uint8(); //Node RSSI //read the base station rssi uint8 baseRSSI = data.read_uint8(); //Base RSSI //get the checksum sent in the packet uint16 checksum = data.read_uint16(); //Checksum //build the checksum to calculate from all the bytes ChecksumBuilder calcChecksum; calcChecksum.append_uint8(startOfPacket); calcChecksum.append_uint8(deliveryStopFlag); calcChecksum.append_uint8(appDataType); calcChecksum.append_uint32(nodeAddress); calcChecksum.append_uint16(payloadLength); calcChecksum.appendBytes(payload); calcChecksum.append_uint8(nodeRSSI); calcChecksum.append_uint8(baseRSSI); //verify that the returned checksum is the same as the one we calculated if(checksum != calcChecksum.fletcherChecksum()) { //Bad Checksum return parsePacketResult_badChecksum; } DeliveryStopFlags flags = DeliveryStopFlags::fromByte(deliveryStopFlag); //add all the info about the packet to the WirelessPacket reference passed in packet.deliveryStopFlags(flags); packet.type(static_cast<WirelessPacket::PacketType>(appDataType)); packet.nodeAddress(nodeAddress); packet.payload(payload); packet.nodeRSSI(static_cast<int16>(nodeRSSI) - 205); packet.baseRSSI(static_cast<int16>(baseRSSI) - 205); packet.frequency(freq); //Correct the packet type if it is incorrect WirelessPacketUtils::correctPacketType(packet); //make sure the packet is valid based on its specific type if(!WirelessPacketUtils::packetIntegrityCheck(packet)) { //not a valid packet, failed integrity check return parsePacketResult_invalidPacket; } //check if the packet is a duplicate if(isDuplicate(packet)) { //even though it is a duplicate, we still have a complete packet so commit the bytes to skip over them savePoint.commit(); //duplicate packet return parsePacketResult_duplicate; } //we have a complete packet, commit the bytes that we just read (move the read pointer) savePoint.commit(); return parsePacketResult_completePacket; }
InertialParseResult InertialParser::parseAsPacket(DataBuffer& data, InertialPacket& packet) { //Assume that we are at the start of a packet //byte 1 - Start of Packet 1 (0x75) //byte 2 - Start of Packet 2 (0x65) //byte 3 - Descriptor Set //byte 4 - Payload Length //byte 5 to N-2 - Payload //byte N-1 - Checksum (MSB) //byte N - Checksum (LSB) //create a save point for the DataBuffer ReadBufferSavePoint savePoint(&data); std::size_t totalBytesAvailable = data.bytesRemaining(); //make sure we have enough bytes to even be a MIP packet if(totalBytesAvailable < InertialPacketInfo::MIP_MIN_PACKET_SIZE) { //Not Enough Data to tell if valid packet return inertialParserResult_notEnoughData; } //read the first 2 bytes uint16 startOfPacket = data.read_uint16(); //Start of Packet //verify that the Start of Packet value is correct if(startOfPacket != InertialPacketInfo::INERTIAL_PACKET_START_OF_PACKET) { //Invalid Packet return inertialParserResult_invalidPacket; } //read byte 3 uint8 descriptorSet = data.read_uint8(); //Descriptor Set //read byte 4 uint8 payloadLen = data.read_uint8(); //Payload Length //determine the full packet length uint32 packetLength = payloadLen + InertialPacketInfo::MIP_NUM_BYTES_BEFORE_PAYLOAD + InertialPacketInfo::MIP_NUM_BYTES_AFTER_PAYLOAD; //the DataBuffer must be large enough to hold the rest of the packet if(totalBytesAvailable < packetLength) { //Not Enough Data to tell if valid packet return inertialParserResult_notEnoughData; } //create the Bytes vector to hold the payload bytes Bytes payload; payload.reserve(payloadLen); //loop through the payload for(uint8 payloadItr = 0; payloadItr < payloadLen; payloadItr++) { //store the payload bytes payload.push_back(data.read_uint8()); //Payload Bytes } //get the checksum sent in the packet uint16 checksum = data.read_uint16(); //Checksum //build the checksum to calculate from all the bytes ChecksumBuilder calcChecksum; calcChecksum.append_uint16(startOfPacket); calcChecksum.append_uint8(descriptorSet); calcChecksum.append_uint8(payloadLen); calcChecksum.appendBytes(payload); if(checksum != calcChecksum.fletcherChecksum()) { //Bad Checksum return inertialParserResult_badChecksum; } //add all the info about the packet to the InertialPacket reference passed in packet.descriptorSet(descriptorSet); packet.payload(payload); //we have a complete packet, commit the bytes that we just read (move the read pointer) savePoint.commit(); return inertialParserResult_completePacket; }