https://devzone.nordicsemi.com/f/nordic-q-a/39233/what-the-tid-transaction-number-meansHello, I read in the documentation how to create a model, in the client model, which defines a struct: simple_on_off_msg_set_t {uint8_t on_off, uint8_t tid}. I do not understand what the TID (Transaction number) means? Why use it?en-USTelligent Community 13Mon, 08 Oct 2018 13:55:46 GMThttps://devzone.nordicsemi.com/thread/152083?ContentTypeID=1Mon, 08 Oct 2018 13:55:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:73d51a60-bf07-45c9-93e3-ab99df8e54b9Joakim Jakobsen<p>Hi.</p> <p>TID (Transaction number) is supposed to be used to differentiate between which message is the &quot;last&quot; received command. <br />In Mesh, a sequence &quot;On&quot; then &quot;Off&quot; may be sent. But on the receiving side this might be recieved as &quot;Off&quot; then &quot;On&quot;, depending on the route it took. <br />The TID let&#39;s you determine whih was the last command that was sent.</p> <p>Which SDK are you working with? <br />I would suggest upgrading to the latest nRF5 SDK for Mesh (currently v.2.2.0), and looking at Generic OnOff instead of Simple OnOff.</p> <p>Best regards, <br />Joakim.</p><div style="clear:both;"></div>