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======= NetRomX - Extended NetRom =======

NetRomX is an [[packet:xrouter|XRouter]] extension to the NetRom protocol, providing up to 65536 different "services" on a single SSID (Secndary Station IDentifier).

Paula G8PZT published the idea in July 2001, in a [[packet:packet-white-papers-about|Packet White Paper]] entitled "NET/ROM DATA MULTIPLEXING" [[packet:netrom-data-multiplexing|PWP109]], and it was incorporated into XRouter.

So far, only XRouter supports NetRomX.

NetRomX is simply standard NetRom, with a different type of connect request, given the mnemonic CREQX (Connect REQuest eXtended). 

This type of request includes a 16-bit "service number", and can therefore request connection to any of 65536 separate types of process on the target system.

This is a major improvement over "standard" NetRom, which only allowed a node to host a maximum of 16 L4 services, one per SSID. This was not just a barrier to the development of novel services... In order to be connectable via L4, every such SSID had to be in everyone's nodes tables. And there was no agreement on which SSID should represent which service.

With NetRomX there is no need to clutter the nodes tables with SSID's, because every service has a STANDARD number, as shown in the table below.

If you know that the target system is XRouter (usually they have "XR" in the alias), you can be sure that if their PMS is enabled, it will be on service 2.

Standard services facilitate simple commands such as "TIME <nodecall>", to discover the local time, time zone and daylight saving status at a distant node. Or "PMS <nodecall>" to connect directly to someone's PMS.

It is envisaged that some of the services may be used by network crawlers (human and machine) to harvest data without needing to know the exact format of the commands on all the different types of software.

====== Standard Services ======

These are the service numbers that have been allocated so far. Services NOT marked "(reserved)" are already implemented in XRouter and must not be used for any other service type:

        No.     Service   Description
        ------------------------------------------------------------
        0       CMD       Normal connection to Node's command line
        1       INFO      Standard Information server
        2       PMS       Personal Message System
        3       BBS       (reserved for Bulletin Board System)
        4       DX        (reserved for DX cluster/dx-spot feed)
        5       TPP       (reserved for "Tampa Ping-Pong" chat)
        7       ECHO      Echoes data back to sender
        8       CHAT      XRChat server
        9       DISCARD   Data sink
        10      RMS       (reserved for winlink RMS}
        11      BPQCHAT   (reserved for BPQ chat server)
        13      DAYTIME   Local date/time (similar to RFC867)
        14      APRS      APRS Server
        15      APRSH     APRS Server (Human Readable)
        16      WX        Local weather information
        17      TELEM     (reserved for Telemetry server)
        18      SMS       Short Message System server
        19      CHARGEN   Generates a test pattern
        20      NDATA     (reserved for NFTP extension)
        21      NFTP      Netrom File Transfer Protocol
        22      NSSH      (reserved for secure login - if legal?)
        23      TELNET    Normal L4 login (same as 0)
        25      SMTP      SMTP (Simple Mail Transfer Protocol) Server
        26      MHEARD    MHEARD server (shows MH lists)
        27      DXLIST    DX List server (shows DX lists)
        28      WALL      Message Wall (like Facebook of old) / guestbook
        29      BLOG      Sysop's Blog
        79      FINGER    Finger server
        80      HTTP      NetromWeb (HTTP over Netrom) server
        87      NTTY      Netrom TTY - Keyboard to keyboard chat
        110     POP3      POP3 (Post Office Protocol 3) Server
        125     MTP2      Message Transfer Protocol (version 2) server
        1883    MQTT      MQTT Broker


//**"XRouter - Leading the way!"**//

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