The Experts below are selected from a list of 9 Experts worldwide ranked by ideXlab platform

Tftp Usage - One of the best experts on this subject based on the ideXlab platform.

  • TFTP Protocol – Data – ACK (acknowledgment) – Error
    2008
    Co-Authors: Tftp Usage
    Abstract:

    ■ Transfer files between processes. ■ Minimal overhead (no security) ■ Designed for UDP, although could be used with many transport protocols. ■ Easy to implement ■ Small- possible to include in firmware ■ Often used to bootstrap workstations and Network devices. Read Request 01 filename 0 mode 0 2 Byte opcode Network Byte Order null terminated ascii string containing name of file null terminated ascii string containing transfer mode variable length fields! Write Request 02 filename 0 mode 0 2 Byte opcode Network Byte Order null terminated ascii string containing name of file null terminated ascii string containing transfer mode variable length fields! TFTP Acknowledgment 2 Byte opcode Network Byte Order 04 block # 2 Byte block number Network Byte Order TFTP Data Packet 03 block # data 0 to 512 Bytes 2 Byte opcode Network Byte Order 2 Byte block number Network Byte Order all data packets have 512 Bytes except the last one. TFTP Error Packet 05 errcode errstring 2 Byte opcode Network Byte Order 2 Byte error code Network Byte Order null terminated ascii error strin

Nasdaq Glimpse - One of the best experts on this subject based on the ideXlab platform.

  • NASDAQ GLIMPSE 4.1 1 Overview
    2011
    Co-Authors: Nasdaq Glimpse
    Abstract:

    4.1 is a point-to-point data feed connection that provides direct data feed customers with the current state of the NASDAQ execution system with full market participant attribution. NASDAQ GLIMPSE 4.1 uses the same data formats as the TotalView-ITCH 4.1 data feed product. 2 Architecture NASDAQ GLIMPSE 4.1 is a point-to-point data feed product comprised of a series of sequenced messages. Each message is variable in length based on the message type. The messages that make up the NASDAQ GLIMPSE 4.1 protocol are typically delivered using a higher level protocol that takes care of sequencing and delivery guarantees. NASDAQ currently offers the GLIMPSE 4.1 data feed in the SoupBinTCP protocol option only. Please note that GLIMPSE users must login to SoupBinTCP for sequence 1 to correctly receive data. 3 Data Types All integer fields are unsigned big-endian (Network Byte Order) binary encoded numbers. All alpha fields are left justified and padded on the right with spaces. Prices are integer fields. When converted to a decimal format, prices are in fixed point format with 6 whole number places followed by 4 decimal digits. The maximum price in GLIMPSE is 200,000.000

David Gay - One of the best experts on this subject based on the ideXlab platform.

  • General Terms
    2008
    Co-Authors: Kevin Chang, David Gay
    Abstract:

    Development of Network communication in a homogeneous sensor Network environment is straightforward as the nodes can share message layouts simply by letting the compiler lay out messages in an arbitrary fashion and using the same executable code on all nodes. However, this simple approach does not usually work in a heterogeneous sensor Network setting because different compilers may generate different message layouts, and different processors often have different basic type representations and alignments. The traditional solutions to this problem is to either require programmers to insert Network-Byte-Order and host-Byte-Order conversions, or to use a compiler that automatically generates marshalling and unmarshalling routines. Unfortunately, these approaches are inadequate for sensor Networks because they are either error-prone and/or add significant overheads to already resource-constrained sensor motes. Instead, we propose a language extension — Network types — which supports heterogeneous Networking in a simple and efficient way. We have implemented Network types in the nesC, the language of the TinyOS sensor Network operating system and its applications. We have used Network types to supports heterogeneous Networking betweenmicaz andtelos motes (which have different alignment restrictions). We also show that our implementation introduces a negligible amount of overhead in runtime and code size. Network types have the additional benefit of requiring few changes to existing TinyOS code

Kevin Chang - One of the best experts on this subject based on the ideXlab platform.

  • General Terms
    2008
    Co-Authors: Kevin Chang, David Gay
    Abstract:

    Development of Network communication in a homogeneous sensor Network environment is straightforward as the nodes can share message layouts simply by letting the compiler lay out messages in an arbitrary fashion and using the same executable code on all nodes. However, this simple approach does not usually work in a heterogeneous sensor Network setting because different compilers may generate different message layouts, and different processors often have different basic type representations and alignments. The traditional solutions to this problem is to either require programmers to insert Network-Byte-Order and host-Byte-Order conversions, or to use a compiler that automatically generates marshalling and unmarshalling routines. Unfortunately, these approaches are inadequate for sensor Networks because they are either error-prone and/or add significant overheads to already resource-constrained sensor motes. Instead, we propose a language extension — Network types — which supports heterogeneous Networking in a simple and efficient way. We have implemented Network types in the nesC, the language of the TinyOS sensor Network operating system and its applications. We have used Network types to supports heterogeneous Networking betweenmicaz andtelos motes (which have different alignment restrictions). We also show that our implementation introduces a negligible amount of overhead in runtime and code size. Network types have the additional benefit of requiring few changes to existing TinyOS code