Code rewrite to make the code more modular.

Fixed issue where newer firmware "20241226" wouldn't actually work correctly.

Needs testing on older firmware to see if they still work

src/util.rs

@@ -0,0 +1,54 @@
+use log::warn; // Use log crate
+
+/// Reads a specific bit from a u16 value.
+/// `position` is 0-indexed (0-15).
+pub(crate) fn read_bit(value: u16, position: u8) -> bool {
+    if position > 15 {
+        warn!("read_bit called with invalid position: {}", position);
+        return false;
+    }
+    (value & (1 << position)) != 0
+}
+
+/// Sets or clears a specific bit in a u8 value.
+/// `bit_position` is 0-indexed (0-7).
+/// Returns the modified u8 value.
+pub(crate) fn set_bit(value: u8, bit_position: u8, bit_value: bool) -> u8 {
+    if bit_position > 7 {
+        warn!("set_bit called with invalid position: {}", bit_position);
+        return value; // Return original value on error
+    }
+    if bit_value {
+        value | (1 << bit_position) // Set the bit to 1
+    } else {
+        value & !(1 << bit_position) // Set the bit to 0
+    }
+}
+
+/// Combines high and low bytes into a u16 value.
+pub(crate) fn merge_u8_into_u16(high_byte: u8, low_byte: u8) -> u16 {
+    (high_byte as u16) << 8 | (low_byte as u16)
+}
+
+/// Checks if a device firmware string is supported.
+/// TODO: Implement actual firmware checking logic if needed.
+pub(crate) fn is_supported(firmware_string: String) -> bool {
+    // Currently allows all devices.
+    // If you re-enable firmware checking, use the `args` or a config setting.
+    // let args = crate::main::Args::parse(); // Need to handle args properly
+    // if args.skip_firmware { return true; }
+
+    // Example fixed list check:
+    // let supported_firmware = [
+    //     "VIRPIL Controls 20220720",
+    //     "VIRPIL Controls 20230328",
+    //     "VIRPIL Controls 20240323",
+    // ];
+    // supported_firmware.contains(&firmware_string.as_str())
+
+    if firmware_string.is_empty() || firmware_string == "Unknown Firmware" {
+        warn!("Device has missing or unknown firmware string.");
+        // Decide if these should be allowed or not. Allowing for now.
+    }
+    true
+}