OPC Client Failover

Hi,

For OPC Client Failover, I have 3 ignition GW
In 1:
• GW1 Master active
• GW2 Backup cold
• The OPC client connected to the master
In 2 :
• GW1 Master inactive
• GW2 Backup active
• OPC client connected to backup
In 3:
• GW1 Master active
• GW2 Backup cold
• OPC client connected to backup

How to force the OPC client to be connected to the Master?
And when I stop and start GW2, the opc connection to GW2 does not work, how to solve this problem (I have to switch it to independent after backup to restart properly)?