| Re: [wakaama-dev] Best practice of life time parameter |
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Henrik, I'll try to answer both of your emails at once. You don’t say if you are using DTLS or not, so I will assume you are not. With the device sleeping with the network connection closed, you should be using Queue Mode as specified in section 8.3 of OMA-TS-LightweightM2M-V1_0_1-20170704-A. This means you should be sending a registration update every time you
wake up. As long as the server life time is greater than your report interval you should be good. With cellular not being 100% reliable, you may want to make it several times the reporting interval to allow some number of failed attempts before needing a new
registration. This is largely dependent on your requirements. Calling lwm2m_update_registration once you have opened the socket again will send the registration update. If have a dynamic IP address, you are probably getting a different IP address every time. In this case, the server life time is pretty much a non-issue. According to section 8.2.4 of OMA-TS-LightweightM2M-V1_0_1-20170704-A, a new registration
would be required on each connection: When a new DTLS Session is started, or in NoSec mode when the LwM2M Client IP address changes, the Client MUST register again to the LwM2M Server. To force a new registration in Wakaama, it looks like you would call lwm2m_close to free the context and start over. You could also go through the context and reset everything manually. Regards, Scott Bertin
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