[Xen-API] Emulated serial timeout of guest machines

[Pugnator <ookami@xxxxxxx>]

I need to access guest vms even if they are out of network: some tests 
in my environment should be processed without network or with only one 
NIC that have private IP and I can't use it remotely.
I need to send system commands, upload files, watch activities, collect 
data (that all for software automation)
As there is no "client API" like VIX, I tried to workaround it via 
emulated serial.
I enabled emulated serial on each vm like this:

xe vm-shutdown force=true uuid=XXXXXXXX
xe vm-param-remove param-name=other-config param-key=hvm_serial 
uuid=XXXXXXXX
xe vm-param-set uuid=XXXXXX other-config:hvm_serial=" tcp:XXXXXXX:YYYY"
xe vm-start uuid=XXXXXXXXX

On guest machine (HVM, Lin and Win) there is perl terminal client to 
receive and send data back. All ok, I can manage guest machine and send 
files. But there are some issues:
1) If TCP client is down when guest VM is started, there is no way to 
reconnect again. The only way is to reboot guest or suspend/resume it. 
Also if connection lost during work it is also need to reboot guest.
Is there any way to restart this service somehow?

2) If I send data in one peace guest stops receiving data after 4096 
bytes. Guest VM should send at least one byte back and it can receive 
data again.
Is it ok or it can be set up somewhere?

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