Question

we are running several instances of data collecting software gathering data over IP network. end equipment is connectd to  rut955 serial. Currently rut955 passes all requests to the equipment which which leads to incomplete and malformed answers. Is there any way to limit concurent (simultanious) connections on serial port?  

configuration used

Answer 1

Hi,

There is no configuration options in RS232, which can limit number off to connection to serial device. At the moment, only solution I can suggest is to use firewall rules and limit number of connections per TCP port.

Enter following rule in Network -> Firewall -> Custom Rules. This rule will allow only one connection for 2320 port and until first device release connection, no other device will be alowed to connect.
 

iptables -I INPUT -p tcp --syn --dport 2320 -m connlimit --connlimit-above 1 -j REJECT --reject-with tcp-reset

Comments

we will try this. Thank You.