Decoding APER X2AP_PDU error

[veselij]

Hi,
I have compiled ASN for 3GPP TS 36423-gd0.docx (LTE X2_AP) and now I am trying to decode asn messages, but always getting same error:

Err(Error { cause: Generic, msg: "Key 43229 Not Found", context: [] })

I checked ASN message with another decoder - it was successfully decoded. X2AP does not mentioned in supported list, may be that is the reason? Or I am doing something wrong:

rs-asn1c --module x2.rs --codec aper -- x2.asn

            let mut x2_codec_data = PerCodecData::from_slice_aper(&k.message);
            let x2_pdu: Result<x2::X2AP_PDU, PerCodecError> =
                x2::X2AP_PDU::aper_decode(&mut x2_codec_data);

            println!("{:?}", x2_pdu);

raw X2AP_PDU in hex str (k.message in example above Vec)

"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"

[gabhijit]

Hi @veselij,

Thank you for reporting the issue. Can you please run this with a trace level debug and send the output of the decoder trace logs here?

That will help in finding out the issue.

The crate is not tested against X2AP and it's codec, but the functions should work for any aper encoded protocol message. Likely it's a bug in the implementation, or perhaps the codec is not handling some incorrectly encoded strings which are otherwise handled by the other codec. Having trace level debugging should help identify that.

Thanks