Feature: max_bytes runtime conditional (to support different channel types)

[tsaubergine]

On 9/21/22 19:57, Fenucci, Davide wrote:

I saw your recent DCCL update about dynamic conditions - that looks
awesome, and I was wondering if we could use it to achieve the following.
We have a message with a repeated field for which we set the max_repeat
attribute to fit in the max_bytes of the message - consider the
following message as a minimal example:

message Test {
option (dccl.msg) = {
id: 2,
max_bytes: 82,
codec_version: 4
};

repeated uint32 field = 1 [ (dccl.field) = { min: 0 max: 4294967295
max_repeat: 20 } ];
}

Now, what we would like to do is to send the same message over different
communication channels having different length constraints (WiFi,
acoustic and Iridium, in particular) - do you think it would make sense
to dynamically adjust the max_bytes and max_repeat attributes based on
the value of a field that will contain the type of channel used? Say
something along the lines of the following:

message Test {
option (dccl.msg) = {
id: 2,
max_bytes: 82,
codec_version: 4
dynamic_conditions: { max_bytes: "if this.channel == "WiFi"; then
return 1000000; else if this.channel == "Acoustic"; then return 60; ...
end" }
};