Limit i_set within range of MAX1968 chip

src/command_handler.rs

@@ -54,7 +54,8 @@ pub enum Handler {
 pub enum Error {
     ReportError,
     PostFilterRateError,
-    FlashError
+    FlashError,
+    InputOutOfRangeError,
 }
 
 pub type JsonBuffer = Vec<u8, U1024>;
@@ -185,6 +186,10 @@ impl Handler {
         match pin {
             PwmPin::ISet => {
                 channels.channel_state(channel).pid_engaged = false;
+                if -3.0 < value || value > 3.0 {
+                    send_line(socket, b"{\"error\": \"i_set out of range\"}");
+                    return Err(Error::InputOutOfRangeError);
+                }
                 let current = ElectricCurrent::new::<ampere>(value);
                 channels.set_i(channel, current);
                 channels.power_up(channel);