Vendor model opcodes

[AndyM]

I have a vendor model bt_mesh_model_op defined as follows

const struct bt_mesh_model_op _admin_model_ops[] = {

    { BT_MESH_MODEL_OP_3(OPCODE_SET_UNACK, VENDOR_CID), BT_MESH_LEN_EXACT(4),  event_set_unack},

    BT_MESH_MODEL_OP_END,

};

OPCODE_SET_UNACK is an enumeration

If the value is 0 - 3 I get "invalid message size"  when publishing the message

If the value is > 3 the message goes out

Are the values 0-3 reserved ? Where is it documented?
What are the guidelines for creating vendor specific opcodes?
Thanks

[Elfving]

Hello again, and sorry about the wait!

The usage of vender specific opcodes is documented in section 3.7.3.1 in the Mesh Profile Spec.

For an example on how this can be implemented, you could also have a look at the chat example in NCS.

Regards,

Elfving

[AndyM]

Anything higher than 0x03 works. I was just curious why.  It's odd because  0x04 that I use is on your list as well.

I'll try 0x10 so it does not conflict with your opcodes

Question 

0x04 is listed as "Simple OnOff Status" 

What's the size of the message for this opcode? If it's 8 bytes - that would explain why I don't get "invalid message size" when I use it . 

Thank you

[Elfving]

AndyM said:

What's the size of the message for this opcode? If it's 8 bytes - that would explain why I don't get "invalid message size" when I use it . 

The contents and length of the messages can be found here. 

I should mention that if you are simply testing, or not using this to make your own products it doesn't matter what company ID you use. However, using the Nordic ID for this isn't good (We might for instance decide to add another opcode which might conflict with yours). There is a special value for such purposes which is 0xFFFF (for more info see here). If you want to sell products however you would of course need to qualify the products and get your own company ID.

Btw, could you give me the exact wording of the error message you were getting? 

Regards,

Elfving