simtrace February 2026

simtrace@lists.osmocom.org

3 participants
2 discussions

eSIM Profile Personalization and Dynamic Updates
by s.schmidt＠embedsmart.de 13 Feb '26

13 Feb '26

Dear Osmocom community, I am looking into the osmo-smdpp.py proof-of-concept and the pySim library (specifically looking at pySim/esim/saip/personalization.py). My goal is to customize an eSIM profile so that it presents a generic/custom string to the base station during the connection establishment. I have a few specific questions regarding the best approach: * Profile Personalization: In personalization.py, which Elementary Files (EF) would you recommend modifying to ensure a custom string is visible to the network side (e.g., EF.SPN, EF.PNN, or others)? * Dynamic Content: Is it feasible to update these strings dynamically on the eUICC without re-downloading the entire profile, for example via a Java Card applet or specific OTA commands supported by the Osmocom stack? * Lab Setup: I am hoping to set up a local base station to test the interaction with this modified eSIM. Which hardware would you recommend for testing this? I already have a red pitaya and am considering setting up a radio front-end for it. However, Calypso phones are cheaper and I wonder if they would be sufficient for this test. Any guidance on which parts of the pySim codebase I should focus on for this "on-the-fly" customization would be greatly appreciated. Best regards, Siemon

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pySIM packaging
by Sergey Ryazanov 04 Feb '26

04 Feb '26

Hi Harald, Thank you for developing and maintaining such great software as pySIM. To support these Gentoo users who are curious about telecom I have crated an unofficial ebuild (package) with all required dependencies. Thanks to Pentoo maintainers, these packages are available for broader audience via the corresponding portage overlay [1]. While creating the package, I faced few obstacles: 1. absence of a fresh release, so pySIM was packaged in a bleeding edge manner when on every installation the latest snapshot is downloaded and installed 2. asn1tools fork with single custom change Installation of the latest snapshot might be inconvenient for end-users since cannot offer stability and subjected to a random issues which you can expect from a software under a heavy development. As far as I understand, asn1tools has been forked to introduce order to SET and SEQUENCE types. It is hard to me to estimate all the side-effects of this change. So, I've packaged the fork as a separate package 'asn1tools-osmocom'. What also can be inconvenient for ordinary users due to possible collision with the original package. Also, upstream asn1tools has got a pyparsing fix [3] for tests which I had to disable creating asn1tools-osmocom. Harald, do you have any plans to collaborate with asn1tools maintainers to get the ordered types available in the upstream? This can greatly facilitate the packaging work and make pySIM stably available for end-users. 1. https://github.com/pentoo/pentoo-overlay/commit/5011abefd624db8544a95d3515f… 2. https://github.com/osmocom/asn1tools/commit/44277cdb34959196f317b6a02af20a4… 3. https://github.com/eerimoq/asn1tools/commit/bce6f497711e47cc3b442e073c8f264… -- Sergey

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simtrace February 2026