Retired (2013) Electrical/I&C Engineer - CS background. Recently completed HW, SW, and SN1 unit for recreational power/sail boat status/trouble monitoring w/ SMS messaging. I am migrating the C++ application and this product to Rpi3/4 from Arduino Mega2560. My first question for StackExchange was answered correctly in quick time - and the big takeaway is access to this forum. Thanks for a great resource.