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Sylvain Munaut 246tnt at gmail.comSome more infos ... 1) I changed the mframe_schedule a bit so that when changing task, we deactivate the first then wait a little before activating the next one. I think it would have been possible that previous MF task scheduled something that would conflict with the new MF task ... 2) I replaced the SDCCH8_0 task with a custom one : static const struct mframe_sched_item mf_rx_all_nb[] = { { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 0 }, { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 4 }, { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 8 }, { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 12 }, { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 16 }, { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 20 }, { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 24 }, { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 28 }, { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 32, .flags = MF_F_SACCH }, { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 36, .flags = MF_F_SACCH }, { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 40, .flags = MF_F_SACCH }, { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 44, .flags = MF_F_SACCH }, { .sched_set = NULL } }; This basically is RX only and receives all SDCCH and SAACH on the timeslot. When I do this, I see the good data on SAACH and SDCCH correcponding to subchannel 0. (everything else is garbage). But if I try a custom task that just RX subchannel 0 : static const struct mframe_sched_item mf_rx_all_nb[] = { { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 0 }, { .sched_set = NB_QUAD_FH_DL, .modulo = 2*51, .frame_nr = 32, .flags = MF_F_SACCH }, { .sched_set = NULL } }; Then, it doesn't work, I don't see the SI5/6 messages on SAACH. Cheers, Sylvain