iterating ASN.1 objects

[abouillot-stl]

Hello,

I'm trying get an object iterating an ASN.1 object.

I have a rrcReconfiguration message. I can iterate through it and get objects from most of the hierarchy, but when looking into the reportConfigToAddModList, it always return the last item of the sequence.

I can access the values of the different items reportConfigToAddModList if I iterate the serialization of the object.

I guess I miss something about the usage of the get_obj_at function in this particular case of SEQ OF SQUENCE

Here is the code snippet to show it:

import binascii
import re
from pycrate_asn1dir import RRCNR
from pycrate_asn1rt.utils import get_val_at, get_obj_at


payload = """
00 29 56 04 07 80 01 04  49 c1 00 40 00 1c 01 40
30 02 f0 00 20 67 28 20  08 00 03 80 28 06 00 80
20 06 a2 90 03 80 24 04  c0 02 00 70 08 81 12 00
80 0f c0 02 00 28 c6 51  01 80 50 28 05 c1 00 48
24 12 c0 01 00 47 40 01  00 80 89 01 b0 48 ca 82
80 31 00 00 00 e0 fc 04  c7 3e c3 50 04 fc 00 84
02 12 ee 00 17 e4 05 f0  21 00 02 03 47 50 72 80
a8 0e 00 05 f0 20 00 00  02 2a 2c 02 02 08 02 00
00 04 08 02 00 00 0c 08  02 00 00 0e 08 02 00 00
02 22 0a 82 02 00 00 14  62 36 02 02 08 02 00 00
14 08 02 00 00 02 08 02  00 00 04 08 02 00 00 0c
08 02 00 00 0e 42 04 06  00 bc 03 7c 68 10 06 3e
33 e2 06 3e 23 e4                               
"""

msg = binascii.a2b_hex(re.sub(r"\s+", "", payload))

dl_dcch = RRCNR.NR_RRC_Definitions.DL_DCCH_Message
dl_dcch.from_uper(msg)
meas = get_obj_at(dl_dcch, ["message", "c1", "rrcReconfiguration", "criticalExtensions", "rrcReconfiguration", "measConfig"])
# reports is ReportConfigToAddModList ::=        SEQUENCE (SIZE (1..maxReportConfigId)) OF ReportConfigToAddMod
reports = get_obj_at(meas, ["reportConfigToAddModList"])
# will only return the last item of the Seq of Sequence
for i in range(len(reports())):
    # report is expected to be ReportConfigToAddMod ::=            SEQUENCE {
    # at the given index
    report = get_obj_at(reports, [i])
    print(f"--- {i} ---")
    # But only 3rd and last item presented
    print(report.to_json())

# will present the 3 differents report to add
for i in range(len(reports())):
    report = reports()[i]
    print(f"--- {i} ---")
    print(report)

Any hints on get_obj_at usage would be welcome.

Thanks