Remote Control Pre-Connect Overhead

Version 1

    This covers the data usage for a single pre-connection for RC 4.1

     

    Pre-connect

    Bytes

    Ethernet

    Packets

    From Device

    450

    365

    8

    From Server

    33

    904

    6

    Disconnect

    0

    60

    1

    Total

    483

    1329

    15

     

    The Bytes column shows the actual payload bytes transmitted during a pre-connection with 483 bytes total. The Ethernet column shows the amount of bytes transmitted including the Ethernet/IP/TCP overhead and comes to a total of 1329 bytes.

    When a pre-connected device sits idle too long, it will terminate the connection and reconnect every 30 minutes. The termination will cause another reset packet to be sent from the device (another 60 bytes.)

    The total estimated bandwidth used by an idle (always on) device:

    1329 bytes/connection * 48 connections/day = 63792 bytes/day or 1913760 bytes/month or about 2 megabytes/month.

    Disclaimers:

    • For GPRS, it is unclear how the packet will be encapsulated and what the overhead will be. (It will not be the same as Ethernet.) So, the numbers above may be calculated differently by the customers cellular provider.
    • Whenever the IP address for a device changes, the device will reconnect. Also when the IP address goes away and comes back, as can happen during a suspend/resume on WIFI networks, the device will reconnect.
    • These numbers only reflect the pre-connection process, and do not reflect any usage after the device is connected to and viewed.
    • These numbers show only the best case scenario and do not account for retransmissions that may be required.
    • This is only an estimate, your mileage may vary.