use protocol version instead of crate version

Author: Skywalker8510

Cargo.lock

@@ -3,6 +3,9 @@ edition = "2024"
 name    = "archer"
 version = "1.3.3"
 
+[package.metadata]
+ProtocolVersion = "1.3.3"
+
 [[bin]]
 name = "archer"
 test = false
@@ -34,6 +37,9 @@ thiserror = { version = "2.0", default-features = false }
 embedded-io = "0.7.1"
 esp-bootloader-esp-idf = { version = "0.4.0", features = ["esp32"] }
 
+[build-dependencies]
+cargo_metadata = "0.23.1"
+
 [profile.dev]
 # Rust debug is too slow.
 # For debug builds always builds with some optimization

Cargo.toml

@@ -1,3 +1,8 @@
+use cargo_metadata::MetadataCommand;
+
 fn main() {
+    let metadata = MetadataCommand::new().no_deps().exec().unwrap();
+    let protocol_version = metadata.root_package().unwrap().metadata["ProtocolVersion"].as_str().expect("ProtocolVersion must be a string in the format of X.X.X");
+    println!("cargo:rustc-env=PROTOCOL_VERSION={}", protocol_version);
     println!("cargo:rustc-link-arg=-Tlinkall.x");
 }

build.rs

@@ -177,7 +177,7 @@ pub async fn parse_command<I: embedded_hal::i2c::I2c>(
             return Ok(is_calibrated.to_string());
         }
         "VERS" => {
-            return Ok(env!("CARGO_PKG_VERSION").to_string());
+            return Ok(env!("PROTOCOL_VERSION").to_string());
         }
         "SSPD" => match arguments.next() {
             Some("VER") => {