what are the outputs of all your traces?
perhaps these can help you:
- I think hardware flow control (DCE/DTE) is normally on. have you set these signals on the right levels? you can switch this off with at+ifc=0,0
- move the adl_fcmSwitchV24State call into uart2_ctrl_handler after ‘case ADL_FCM_EVENT_FLOW_OPENNED’ and ‘case ADL_FCM_EVENT_V24_AT_MODE’ (but you can’t close fcm while it is in data mode!)