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Can't set different max_count values for different sub-messages of the same type #1031

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philbinj opened this issue Nov 8, 2024 · 1 comment
Open

Can't set different max_count values for different sub-messages of the same type #1031

philbinj opened this issue Nov 8, 2024 · 1 comment

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@philbinj
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philbinj commented Nov 8, 2024

For example, for this proto:

message FloatArray {
  repeated float xs = 1;
}
message Msg {
  FloatArray a = 1;
  FloatArray b = 2;
}

How can I set different max_count values for a and b? The following options file doesn't seem to work:

Msg.a.xs max_count:50
Msg.b.xs max_count:100
@PetteriAimonen
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They both use the same submessage type, so it is not possible by just using nanopb options. Because the same C struct is used for both, they cannot have different sizes.

If the arrays were directly in the main message (instead of wrapped in a submessage), this would be possible. Another way would be to have separate submessage types in .proto.

You can do this with callback_datatype and a custom callback function, but that quickly gets pretty complex.

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@philbinj @PetteriAimonen