When 6212 is using NFCIP-1 in target mode, is the mode active or passive at the radio level? We have *an initiator* device with only active mode and can't connect to the phone. We have a doubt that this could be one of the reasons.

When the NFCIP-1 device, which is in target mode, is active it responds to the initiator by making its own field (and initiator shuts down its field). If using passive mode, the target will respond with load modulation (like the one that RFID-tag uses).