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GSM 24.008 also allows a P-TMSI field in Detach request messages. This patch adds gbprox_parse_gmm_detach_req() to parse Detach Request messages which sets the ptmsi field if the IE is present. In addition, when power_off is set to 1 (MO only), the invalidate_tlli field is set, since Detach Request message is expected in this case. The second detach test (see 'RA update') is modified to use power_off instead of relying on a Detach Accept from the network. To make this work, the PTMSI of the RA Update Accept is fixed to match the TLLI of the Detach Request. Sponsored-by: On-Waves ehf
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