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Issuing JOIN command frequently. 

Hello,

How often should the JOIN command be issued? I mean, I don´t think the session keys expire but what if the gateway is rebooted, but the devices don´t ? Sometimes I see that I send uplink messages (non confirmed), the device sends, but the gateway or the network server never receives it. Then I force a new JOIN command and it works. I don´t know why this happens since the device nor the gateway had been reset.

Regards,