I just inherited a project which uses both rxandroidble and rxjava2 (and the associated rxandroid). The previous developer seems to have gotten away with using them together with the versions being just so... But updating any of the related dependencies cause various errors.
Am I correct in assuming rxandroidble is rxjava1 only at this point?
If so, when might there be a version for rxjava2?
Is there a safe (read: stable) way of having both coexist in the same app?
RxAndroidBle is RxJava2 compatible since version 1.5.0 released on 14th of March 2018
Am I correct in assuming rxandroidble is rxjava1 only at this point?
Yes, current stable release 1.4.3 is RxJava1 only.
If so, when might there be a version for rxjava2?
Soon™.
RxJava2 version is worked on. Current status can be checked in the official Github issue.
Status as of 26th Feb 2018: there is a 1.5.0-SNAPSHOT release that is for RxJava2. (It is in a different namespace than RxJava1 version)
Is there a safe (read: stable) way of having both coexist in the same app?
Assuming you are talking about having RxAndroidBle and RxJava2 and RxAndroid for the same version—yes it should be totally fine to have it in one app. There is also an interop library for chaining both versions of RxJava.