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I need a clarification on the contents of the access_reliable_t struct used when sending Mesh messages.

When broadcasting mesh messages I use the access_reliable_t struct to set data.

I need clarification on what the contents indicate. The documentation is sparse and doesn't seem to describe the associations between access_model_handle_t, access_opcode t and access_reliable_cb_t types.

What do the opcodes exactly indicate?

If the model handle and opcode both indicate the recieving model, why have both`?