node-opcua "Transaction has timed out" - node.js

Question

I have setup monitoring on couple of nodeIds using node-opcua package.
It works fine for some time but then started printing some timeout messages.
Here's the journalctl output of my service:
Apr 07 08:02:02 test-machine myservice[559]: Timeout .... waiting for response for ReadRequest { /*RequestHeader*/
Apr 07 08:02:02 test-machine myservice[559]: authenticationToken /* NodeId */: ns=0;i=50
Apr 07 08:02:02 test-machine myservice[559]: timeStamp /* UtcTime */: 2017-04-07T15:01:02.501Z
Apr 07 08:02:02 test-machine myservice[559]: requestHandle /* IntegerId */: 334 0x14e
Apr 07 08:02:02 test-machine myservice[559]: returnDiagnostics /* UInt32 */: 0 0x0
Apr 07 08:02:02 test-machine myservice[559]: auditEntryId /* UAString */:
Apr 07 08:02:02 test-machine myservice[559]: timeoutHint /* UInt32 */: 0 0x0
Apr 07 08:02:02 test-machine myservice[559]: additionalHeader /* ExtensionObject */: null
Apr 07 08:02:02 test-machine myservice[559]: };
Apr 07 08:02:02 test-machine myservice[559]: warning : Transaction has timed out
Apr 07 08:02:15 test-machine myservice[559]: Timeout .... waiting for response for ReadRequest { /*RequestHeader*/
Apr 07 08:02:15 test-machine myservice[559]: authenticationToken /* NodeId */: ns=0;i=50
Apr 07 08:02:15 test-machine myservice[559]: timeStamp /* UtcTime */: 2017-04-07T15:01:15.835Z
Apr 07 08:02:15 test-machine myservice[559]: requestHandle /* IntegerId */: 335 0x14f
Apr 07 08:02:15 test-machine myservice[559]: returnDiagnostics /* UInt32 */: 0 0x0
Apr 07 08:02:15 test-machine myservice[559]: auditEntryId /* UAString */:
Apr 07 08:02:15 test-machine myservice[559]: timeoutHint /* UInt32 */: 0 0x0
Apr 07 08:02:15 test-machine myservice[559]: additionalHeader /* ExtensionObject */: null
Apr 07 08:02:15 test-machine myservice[559]: };
Apr 07 08:02:15 test-machine myservice[559]: warning : Transaction has timed out
Apr 07 08:02:29 test-machine myservice[559]: Timeout .... waiting for response for ReadRequest { /*RequestHeader*/
Apr 07 08:02:29 test-machine myservice[559]: authenticationToken /* NodeId */: ns=0;i=50
Apr 07 08:02:29 test-machine myservice[559]: timeStamp /* UtcTime */: 2017-04-07T15:01:29.169Z
Apr 07 08:02:29 test-machine myservice[559]: requestHandle /* IntegerId */: 336 0x150
Apr 07 08:02:29 test-machine myservice[559]: returnDiagnostics /* UInt32 */: 0 0x0
Apr 07 08:02:29 test-machine myservice[559]: auditEntryId /* UAString */:
Apr 07 08:02:29 test-machine myservice[559]: timeoutHint /* UInt32 */: 0 0x0
Apr 07 08:02:29 test-machine myservice[559]: additionalHeader /* ExtensionObject */: null
Apr 07 08:02:29 test-machine myservice[559]: };
Apr 07 08:02:29 test-machine myservice[559]: warning : Transaction has timed out
Apr 07 08:03:01 test-machine myservice[559]: Timeout .... waiting for response for OpenSecureChannelRequest { /*RequestHeader*/
Apr 07 08:03:01 test-machine myservice[559]: authenticationToken /* NodeId */: ns=0;i=0
Apr 07 08:03:01 test-machine myservice[559]: timeStamp /* UtcTime */: 2017-04-07T15:02:01.928Z
Apr 07 08:03:01 test-machine myservice[559]: requestHandle /* IntegerId */: 337 0x151
Apr 07 08:03:01 test-machine myservice[559]: returnDiagnostics /* UInt32 */: 0 0x0
Apr 07 08:03:01 test-machine myservice[559]: auditEntryId /* UAString */: null
Apr 07 08:03:01 test-machine myservice[559]: timeoutHint /* UInt32 */: 0 0x0
Apr 07 08:03:01 test-machine myservice[559]: additionalHeader /* ExtensionObject */: null
Apr 07 08:03:01 test-machine myservice[559]: };
Apr 07 08:03:01 test-machine myservice[559]: Warning: securityToken hasn't been renewed
Basically I want to keep the monitoring going forever and get the publishes every 15 minutes. So it would be really great if someone can help me with the parameters for that as well.

Answer 1

If you have access to the server you could take a look at this post.
In the post they state that, when you set up your client, the requestedLifetimeCount * requestedPublishingInterval shall be set to at least the PublishRequest.RequestHeader.timeoutHint:
var options = {
requestedPublishingInterval: 1000, // check on server
requestedMaxKeepAliveCount: 2,
requestedLifetimeCount: 100, // check on server
maxNotificationsPerPublish: 10,
publishingEnabled: true,
priority: 10,
}
var subscription = new opcua.ClientSubscription(opcSession, options);