command parsing is moving to lua

src/command.lua

@@ -0,0 +1,15 @@
+cmd_output = ""
+
+if type(cmd) == "string" then
+    if cmd:sub(1, 3) == "PI=" then
+        local hex = cmd:sub(7)
+        local pi = tonumber(hex, 16)
+
+        if pi then
+            set_rds_pi(pi)
+            cmd_output = string.format("+", pi)
+        else
+            cmd_output = "Invalid hex PI"
+        end
+    end
+end