The problem I am trying to solve is best described as:
I have 2 OpenSprinklers, 1 operating in extender mode using a TP Link extender. The extender OS works very well unless the home wifi (with the primary OpenSprinkler connected via ethernet cable) is reset. After a reset the extender OpenSprinkler doesn’t reconnect without me power cycling the device. I read that the 2.1.8 firmware update checks for connectivity and resets the device if the network drops and if so, that would solve this problem.
Sorry about the confusion, but there is no firmware 2.1.8 for OpenSprinkler 2.3 — as the release notes of firmware 2.1.8 explain, this firmware is only for OS 3.0 and OSPi. The next firmware 2.1.9 will be available for OS 2.3