With smartphone penetration across rural Sub-Saharan Africa still lagging behind that of simple phones, low internet connectivity remains a limiting factor to the exponential growth of online platforms. Farmster has developed a simple chatbot to enable rural farmers to join a free, online classified for farm produce without needing to use mobile data or access a smartphone. I share how our chatbot is simple enough for user experience and robust enough to gather information from farmers, and outline remaining challenges for human-machine interactions among least-reached demographics.