Dear all,<div><br></div><div>Right now I am studing on osmGMR code and try to understand how it works. From the code my understanding and concerns are as below:</div><div><br></div><div>1.&nbsp; It looks like osmoGMR gmr1_rx only analyze and decode downlink(Satellite to MES) messages and data,&nbsp; am I right?&nbsp; If there any similar application that can decode both downlink and uplink(MES to Satellite)? Or osmoGMR needs input to implement downlink decode?</div><div><br></div><div>2.&nbsp; A plaintext-decrypt is mentioned in osmoGMR wiki but no detail about how to implement it.&nbsp; &nbsp;Is there a opensource code for A5-1-GMR? Or any other clue that can understand how plaintext decrypt&nbsp; A5-1-GMR? Does osmoGMR need input to implemen it?</div><div><br></div><div>Best Regards,</div><div>Tiger</div>