OsmoBTS with separate Tx and Rx SDRs?

Hello list! I've been digging a bit into the osmo-bts project to explore the GSM stack, and only ever see config information assuming you have a full-duplex TRX radio.  I have a HackRF One I'd like to use for TX and an RTL-SDR I'd like to use for RX (both operating on the 900MHz GSM band), but cannot seem to find any configuration information for setting this up - even though I've seen some mentions in passing to osmo-bts-trx supporing RTL-SDR devices.  I really don't have the budget to drop a few hundred more on a USRP device just to tinker with GSM and was hoping I could get away with two dedicated radios. Can anyone tell me 1. if this kind of setup is even supported and 2. if so, point me to reference material that might help me make the connection? Thanks in advance! -Rob -- ========== Robert Bates Octobang rob(a)octobang.com https://keybase.io/arpieb