Shared Memory Transfer
======================

To transfer shared memory images between computers we can use the shmimTCP system. The goal is to 
make a copy or dummy shared memory on one machine that is then synchronized with the other machine
over a dedicated ethernet connection.

Standard Use 
------------
For our standard use cases of transferring DM commands, the script `dmdispbridge` will setup the system for you.  
For instance, to send `dmtweeter` channel 03 commands from ICC to RTC, on ICC you can run 

::

    [xsup@exao3]$ dmdispbridge dm01disp03

The arguments can be any dm channel:

- dm00dispXX for the woofer
- dm01dispXX for the tweeter
- dm61dispXX - dm66dispXX for GMT segments

To send `dmncpc` commands from RTC to ICC, on RTC you can run

::
    
    [xsup@exao2]$ dmdispbridge dm02disp03



Manual Setup
------------

More complicated uses require you to perform the steps yourself. 
This example shows how to send dmtweeter commands from ICC to RTC.  Note that these are the steps 
performed by `dmsispbridge` for the same operation above, but this can be adapted to other devices/shmims as needed.

First on RTC:

::

   tmux new -s sTCPrc-dm01disp06
  
Then in the tmux session:

::

   $ shmimTCPreceive 8886

Second On ICC:

First create the shmim

::

   cacao
   cacao> mk2Dim "s>tf32>dm01disp06" 50 50
   cacao> exit

Then make the connection (no tmux needed)

::

   $ shmimTCPtransmit dm01disp06 192.168.2.2 8886


This example can be modified for other taskes (e.g. sending camtip to RTC)