TTL setting in nrf52840

Hello,

I want to set my TTL value in a node (nrf52840 dongle) that i use as a relay node.

In prj.conf file I set the node in this way:

CONFIG_BT_MESH_RELAY=y

CONFIG_BT_MESH_RELAY_RETRANSMIT_COUNT=2

What instruction can I insert for setting TTL?

And which is the default value of TTL if I don't set my TTL value?

Thanks in advance

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