Have you check books on "embedded systems("")":https://books.google.com.ph/books?id=mp_neOX_uEEC&pg=PA551&lpg=PA551&dq=isp+protocol+in+embedded+systems&source=bl&ots=b0KjdBbMwZ&sig=29HepCk-m6pH7BpaD23uZ5hMCk8&hl=en&sa=X&ved=0ahUKEwjI_MWev87MAhUBymMKHXtNDb4Q6AEIJjAC#v=onepage&q=isp or on "embedded internet("")":https://books.google.com.ph/books?id=3ZPPBgAAQBAJ&pg=PT505&lpg=PT505&dq=isp+protocol+in+embedded+systems&source=bl&ots=ISRkIy3brA&sig=BEG-sbtlEcji_aC0naQvsS6Am8s&hl=en&sa=X&ved=0ahUKEwjI_MWev87MAhUBymMKHXtNDb4Q6AEIKTAD#v=onepage&q=isp
Implementation of the ISP protocol in embedded systems will help us solve our company https://plvision.eu/embedded-systems/. We help solve a lot of issues.