is sequence number and transaction id equal?

[hariharasudhan]

We are working with DK nrf 52840 and the sdk mesh 3.0, BT sdk  version is15.2 (dimming server example). 

We noticed that when nordic app(nrf mesh - android) send a generic level set command to the generic level server by using sequence number as transaction id.

So is the transaction id always same as sequence number?

[Mttrinh]

Hi,

No, transaction ID is not the same as sequence number. 

Transaction ID is 8 bit, sequence numbers are 24 bit.

[hariharasudhan]

so why is nordic app using sequence nuber as transaction id when they send generic level messages?

here nordic app is receving sequence number from node and passing it as transaction id for GenericLevelSet.

How does it work? 

final GenericLevelSet genericLevelSet = new GenericLevelSet(appKey, 
                mTransitionSteps, mTransitionStepResolution, delay, level, 
                node.getReceivedSequenceNumber());

[Roshan Rajaratnam]

Hi the mesh app currently does not keep track of the transaction IDs. Transaction IDs must be unique for each transaction so the app is using the sequence number as it is since the sequence number is also unique for each message. When implementing your app you may do it differently.

[hariharasudhan]

Hello,

Thank you very much, it was really helpful.