I just meant that OpenThread uses mbedTLS as it’s crypto library, for instance:
From: users@... [mailto:users@...] On Behalf Of Nikos Karamolegkos via lists.zephyrproject.org
Sent: Wednesday, September 9, 2020 10:50
Subject: Re: [Zephyr-users] LWM2M client to nrf582540-DK #nrf52840 #networking
Perfect. I will prepare the configuration for the contribution. I made the changes you proposed and worked (I set MAX_PACKET_SIZE to 1024). Just to be clear by what do you mean by "OT use mbedTLS internally"?