OsmocomDECT » Misc DECT hacks

h1. Misc DECT hacks

Millenia after "deDECTed":https://web.archive.org/web/20161228000817/https://dedected.org/trac and about a decade after the now abandoned [[dect:|OsmocomDECT]] project, a group of people in and around Osmocom started to play with DECT again towards the end of 2022.  There's no big plan, or no specific goal, other than getting more hands-on hack value with consumer DECT hardware, at its lowest levels.

It started with some innocent ringtone-hacking on a Gigaset C430 by @manawyrm, followed by a much appreciated fix for the long-standing bug of Gigaset DECT phones radically over-charging (and eventually killing) their NiMH batteries (see [[Gigaset_C430_Hacking]]).

Initially, this required un-soldering and re-programming the SPI flash.  After the debug UART was identified on the two test pads accessible from the battery compartment, @manawyrm and tobleminer have figured out how to load code into the processor (see also [[ChipsUsed]]). Some initial related tools have been created and collected in the https://github.com/TobleMiner/dialog-sc14441-uart-boot repository. Using this you can execute your own code on the Gigaset C430, C300 and likely many other DECT phones using the Sitel (formerly NatSemi, now Renesas SC14xxx chipset family.  Those who have had an eye on DECT for a longer time will recognize that this family of chips was also used in both the "deDECTed":https://gitea.osmocom.org/dect/dedected/src/branch/master/com-on-air_cs-linux as well as the "OsmocomDECT CoA driver":https://gitea.osmocom.org/dect/linux-2.6/src/branch/master/drivers/dect/coa.  It is also used in the Aastra/Mitel RFP base stations (see "this talk on RFP base stations":https://media.ccc.de/v/osmodevcon2019-100-aastra-mitel-dect-base-station-dissection and "#mifail talk":https://media.ccc.de/v/36c3-10576-mifail_oder_mit_gigaset_ware_das_nicht_passiert).

It's yet unclear where this will lead to. But it definitely is nice to see some people excited about playing with DECT devices again.  If you want to follow developments in real-time, join us on the @#osmocom@ IRC channel on https://libera.chat/

h2. further wiki pages

This is just a random collection of various bits and pieces related to DECT

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