doc: more stuff regarding protocol and domo_node

.gitignore

@@ -1,2 +1,4 @@
 **/target/
 **/*.log
+# random testing
+domo_proto/src/main.rs

doc/domo_node/config.md

@@ -0,0 +1,6 @@
+You can set up the node in very cool ways.
+
+# `node.id` (optional)
+This will set the node's id.  
+Your app may not start if the id is already taken.
+> tip: `0xFF------` is a free subnet in `domo_node`.

doc/domo_node/devnotes.md

@@ -0,0 +1,3 @@
+# Todo
+
+- [ ] `0xFF------` subnet should be free to use without interference.

doc/domo_node/node_types.md

@@ -0,0 +1,45 @@
+The `domo_node` implementation is quite limited.
+It's not made to be used standalone but rather in combination with other tools and use drivers.
+
+# The Master node (`master`)
+Of these, there can only be one.  
+The job of a master node is rather complex.
+
+## Forwarding packets
+The most straight forward job of the node.  
+It works by essentially having a hashmap with a reference to a socket.  
+When a packet comes in the node gets forwarded to the right socket.
+
+## Handling network state
+The master node ensures there are no duplicate identifiers and therefore nodes.  
+Also, it will make sure no invalid updates can be sent.  
+Most packets go through the master node before getting to the source.  
+Most because the subnet node can have private nodes and handle those themselves.
+
+# The Relay node (`relay`)
+The relay node is simple.  
+In config you define where to forward the packets to, and they get delivered to there.  
+
+# The Subnet node (`subnet`)
+This is maybe another advanced node.  
+It's a slave node that also acts as a master node.  
+You can define private nodes in config, and they will be managed by the subnet node.  
+For big domo networks this can be very useful to ensure privacy and keep control.
+
+## Subnet properties
+The `domo_node` implementation ensures a couple properties.
+
+### Lights (`all_lights` = `Switch`)
+With this property you can turn off all the lights in the subnet.  
+This property will be absent is there are no lights present in the subnet.
+
+> TODO: this feature requires distinction between switches and lights.  
+> Either with extra identification information in `0x01`
+
+### Enabled (`enabled` = `Switch`)
+Enable or disable the subnet.  
+Functionality like: Master emulation, forwarding, private nodes will be paused.  
+
+### Forward (`forward` = `Swtich`)
+This will disable the forwarding of the subnet's node.  
+Essentially make the subnet all private.  

doc/proto.md

@@ -99,25 +99,14 @@ there is no command data.
 
 This command will register a node.
 
+You can try to register as a node with a specific device_id but this might result in an error `0x03`.  
+Leave `0` to get a random id.
+
 #### Command data
 
-| offset | size    | name        | description                                    | example      |
-|--------|---------|-------------|------------------------------------------------|--------------|
-| `0x14` | 4 bytes | `device_id` | the device identifier. (reserved for response) | `0x00000000` |
-
-#### Example request
-
-> source should be `0xFFFFFFFF` or MASTER's device id
-
-```
-0x00000000
-```
-
-#### Example response
-
-```
-0x0A001001
-```
+| offset | size    | name        | description                                                | reserved | example      |
+|--------|---------|-------------|------------------------------------------------------------|----------|--------------|
+| `0x14` | 4 bytes | `device_id` | the device identifier. leave `0x00000000` to get random id | no       | `0x00000000` |
 
 ### `0x02` - Remove node
 
@@ -165,9 +154,11 @@ Send a packet to state an error occurred.
 | `0x00`        | `net_duplicate_packet` | `reply_to` packet is invalid because another packet was sent recently with same `packet_id`. | resend with different `packet_id` |
 | `0x01`        | `net_broken_packet`    | recent packet was broken.                                                                    | resend packet                     |
 | `0x02`        | `net_invalid_packet`   | the packet sent is not valid                                                                 | send packet with proper values    |
+| `0x03`        | `net_addr_in_use`      | the addr requested is in use already                                                         | register with another id or `0`   |
 | `0x1*`        | `errc_*`               | **Client errors**                                                                            |                                   |
 | `0x10`        | `errc_not_registered`  | client is not registered                                                                     | register client                   |
 | `0x2*`        | `errs_*`               | **Server errors**                                                                            |                                   |
+| `0x20`        | `errs_not_delivered`   | server could not deliver packet.                                                             | depends on situation              |
 
 ## `0x1*` - Properties control