Reconnect client after server reboot

[matthieu4294967296moineau]

What is the expected behavior of a client if server is rebooted (when I power cycle my PLC) ?

My client is connected to server via Ethernet cable, if I disconnect the cable and call client.State(), I still get Connected status. When I connect again the Ethernet cable, I get Reconnecting status. So checking for client state, I am able to reconnect the client to the server when connection is available. (even if getting Connected status after disconnecting the cable still seems weird to me)

However, if I unplug the power supply to PLC, and then call client.Connect(ctx) I get the error: {"error": "dial tcp 192.168.4.102:4840: connect: connection refused"}. I am actually trying to reconnect in a loop every 2 seconds; after getting this error 4 or 5 times, I get this error: panic: runtime error: invalid memory address or nil pointer dereference

Client has the following options:

opts = append(opts, opcua.AutoReconnect(true))
opts = append(opts, opcua.ReconnectInterval(time.Second*2))
opts = append(opts, opcua.RequestTimeout(time.Second*3))

Is there a way to make the client reconnect after the reboot ? Should I create another client after losing the connection ?

Thank you

[myahuang]

On general,OPCUAserver collecting data from PLC controllers, OPCuaclient poll data from OPCUAserver, client.State() indicate the communication status between client and server.If you want to find the status of communication between server and PLC,you can use method Node(args).Value(),it return data and err,if the err!=nil, the PLC is disconnected from the server.

[myahuang]

This is a wonderful project,take my honor from China!