// Expected command format: // Mode + PID + Replies to gather (optional) // 'M' + HH + 'P' + HH + 'S' + HH + 'R' + H // // Where "HH" is two hex ASCII bytes (e.g. 'F' 'F' for 0xFF). 'M' is for Mode, // 'P' is for PID, 'S' is for size of PID data reply, and 'R' is for reply count. // Note ...