voltage as prometheus gauge

Cargo.lock

@@ -972,6 +972,16 @@ version = "0.1.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c8fae54786f62fb2918dcfae3d568594e50eb9b5c25bf04371af6fe7516452fb"
 
+[[package]]
+name = "io-kit-sys"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4769cb30e5dcf1710fc6730d3e94f78c47723a014a567de385e113c737394640"
+dependencies = [
+ "core-foundation-sys",
+ "mach2",
+]
+
 [[package]]
 name = "ipnet"
 version = "2.9.0"
@@ -1022,6 +1032,26 @@ version = "0.2.151"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "302d7ab3130588088d277783b1e2d2e10c9e9e4a16dd9050e6ec93fb3e7048f4"
 
+[[package]]
+name = "libudev"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78b324152da65df7bb95acfcaab55e3097ceaab02fb19b228a9eb74d55f135e0"
+dependencies = [
+ "libc",
+ "libudev-sys",
+]
+
+[[package]]
+name = "libudev-sys"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c8469b4a23b962c1396b9b451dda50ef5b283e8dd309d69033475fa9b334324"
+dependencies = [
+ "libc",
+ "pkg-config",
+]
+
 [[package]]
 name = "linux-raw-sys"
 version = "0.4.12"
@@ -1059,6 +1089,15 @@ dependencies = [
  "tracing-subscriber",
 ]
 
+[[package]]
+name = "mach2"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19b955cdeb2a02b9117f121ce63aa52d08ade45de53e48fe6a38b39c10f6f709"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "matchers"
 version = "0.1.0"
@@ -1215,6 +1254,17 @@ dependencies = [
  "tempfile",
 ]
 
+[[package]]
+name = "nix"
+version = "0.26.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "598beaf3cc6fdd9a5dfb1630c2800c7acd31df7aaf0f565796fba2b53ca1af1b"
+dependencies = [
+ "bitflags 1.3.2",
+ "cfg-if",
+ "libc",
+]
+
 [[package]]
 name = "nu-ansi-term"
 version = "0.46.0"
@@ -1970,6 +2020,25 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serialport"
+version = "4.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f5a15d0be940df84846264b09b51b10b931fb2f275becb80934e3568a016828"
+dependencies = [
+ "bitflags 2.4.1",
+ "cfg-if",
+ "core-foundation-sys",
+ "io-kit-sys",
+ "libudev",
+ "mach2",
+ "nix",
+ "regex",
+ "scopeguard",
+ "unescaper",
+ "winapi",
+]
+
 [[package]]
 name = "sha2"
 version = "0.10.8"
@@ -2193,7 +2262,7 @@ dependencies = [
 
 [[package]]
 name = "tesla-charge-controller"
-version = "0.1.8-prerelease"
+version = "0.1.8"
 dependencies = [
  "anyhow",
  "async-channel",
@@ -2208,6 +2277,7 @@ dependencies = [
  "rocket",
  "ron",
  "serde",
+ "serialport",
  "teslatte",
  "thiserror",
  "tokio",
@@ -2529,6 +2599,15 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "unescaper"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8f0f68e58d297ba8b22b8b5a96a87b863ba6bb46aaf51e19a4b02c5a6dd5b7f"
+dependencies = [
+ "thiserror",
+]
+
 [[package]]
 name = "unicode-bidi"
 version = "0.3.14"

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "tesla-charge-controller"
-version = "0.1.8-prerelease"
+version = "0.1.8"
 edition = "2021"
 license = "MITNFA"
 description = "Controls Tesla charge rate based on solar charge data"
@@ -29,3 +29,4 @@ metrics-prometheus = "0.6.0"
 prometheus = "0.13"
 env_logger = "0.10"
 log = "0.4"
+serialport = "4.3"

src/api_interface.rs

@@ -1,6 +1,5 @@
 use anyhow::{Context, Result};
 use metrics::{describe_gauge, gauge, Gauge, Unit};
-use metrics_prometheus::Recorder;
 use serde::{Deserialize, Serialize};
 use std::{
     path::PathBuf,
@@ -25,9 +24,7 @@ struct Metrics {
 }
 
 impl Metrics {
-    fn new() -> (Self, Recorder) {
-        let recorder = metrics_prometheus::install();
-
+    fn new() -> Self {
         describe_gauge!("tesla_battery_level", Unit::Percent, "Battery level");
         let battery_level = gauge!("tesla_battery_level");
         describe_gauge!("tesla_charge_rate", "Charge rate");
@@ -41,17 +38,14 @@ impl Metrics {
         describe_gauge!("tesla_battery_heater", "Battery heater");
         let battery_heater = gauge!("tesla_battery_heater");
 
-        (
-            Self {
-                battery_level,
-                charge_rate,
-                charge_request,
-                inside_temp,
-                outside_temp,
-                battery_heater,
-            },
-            recorder,
-        )
+        Self {
+            battery_level,
+            charge_rate,
+            charge_request,
+            inside_temp,
+            outside_temp,
+            battery_heater,
+        }
     }
 }
 
@@ -97,7 +91,7 @@ impl TeslaInterface {
             .next()
             .context("No vehicles attached to account!")?;
 
-        let (metrics, _recorder) = Metrics::new();
+        let metrics = Metrics::new();
 
         let interface = Self {
             state: Arc::new(RwLock::new(Default::default())),

src/config.rs

@@ -8,6 +8,8 @@ use crate::types::Coords;
 pub struct Config {
     pub watch_interval: Duration,
     pub coords: Coords,
+    pub serial_port: String,
+    pub baud_rate: u32,
 }
 
 impl Default for Config {
@@ -18,6 +20,8 @@ impl Default for Config {
                 latitude: 0.,
                 longitude: 0.,
             },
+            serial_port: String::from("/dev/ttyUSB0"),
+            baud_rate: 9600,
         }
     }
 }

src/main.rs

@@ -5,6 +5,7 @@ extern crate rocket;
 
 use api_interface::TeslaInterface;
 use clap::{Parser, Subcommand};
+use pl_interface::Pli;
 use std::path::PathBuf;
 
 use crate::config::Config;
@@ -12,6 +13,7 @@ use crate::config::Config;
 mod api_interface;
 mod config;
 mod errors;
+mod pl_interface;
 mod server;
 mod types;
 
@@ -40,6 +42,8 @@ async fn main() {
     let auth_path = args.config_dir.join("auth");
     let config_path = args.config_dir.join("config");
 
+    let _recorder = metrics_prometheus::install();
+
     match args.command {
         Commands::GenerateConfig => {
             println!(
@@ -56,7 +60,7 @@ async fn main() {
                 let (api_requests, receiver) = async_channel::unbounded();
 
                 let server_handle = server::launch_server(server::ServerState {
-                    config,
+                    config: config.clone(),
                     state: interface.state.clone(),
                     api_requests,
                 });
@@ -76,6 +80,21 @@ async fn main() {
                     }
                 });
 
+                // try to spawn the pli loop
+                match Pli::new(config.serial_port, config.baud_rate) {
+                    Ok(mut pli) => {
+                        tokio::task::spawn(async move {
+                            let mut interval =
+                                tokio::time::interval(std::time::Duration::from_secs(30));
+                            loop {
+                                interval.tick().await;
+                                pli.refresh();
+                            }
+                        });
+                    }
+                    Err(e) => log::error!("Error connecting to serial device for PLI: {e:?}"),
+                }
+
                 server_handle.await;
             }
             Err(e) => error!("{}", e.error_string()),

src/pl_interface.rs

@@ -0,0 +1,55 @@
+use std::time::Duration;
+
+use metrics::{describe_gauge, gauge, Gauge};
+use serialport::SerialPort;
+
+pub struct Pli {
+    port: Box<dyn SerialPort>,
+    voltage_gauge: Gauge,
+}
+
+impl Pli {
+    pub fn new(serial_port: String, baud_rate: u32) -> anyhow::Result<Self> {
+        let port = serialport::new(serial_port, baud_rate)
+            .timeout(Duration::from_millis(250))
+            .open()?;
+
+        describe_gauge!("pl_battery_voltage", "Battery voltage");
+        let voltage_gauge = gauge!("pl_battery_voltage");
+        Ok(Self {
+            port,
+            voltage_gauge,
+        })
+    }
+
+    pub fn refresh(&mut self) {
+        let batv = (self.read_ram(50) as f64) * (4. / 10.);
+        self.voltage_gauge.set(batv);
+    }
+
+    fn send_command(&mut self, req: [u8; 4]) {
+        self.port
+            .write_all(&req)
+            .expect("failed to write to serial port");
+    }
+
+    fn receive<const LENGTH: usize>(&mut self) -> [u8; LENGTH] {
+        let mut buf = [0; LENGTH];
+        match self.port.read_exact(&mut buf) {
+            Ok(_) => {
+                println!("got buf {buf:?}")
+            }
+            Err(e) => println!("read error: {e:#?}"),
+        }
+        buf
+    }
+
+    fn read_ram(&mut self, address: u8) -> u8 {
+        self.send_command(command(20, address, 0));
+        self.receive::<2>()[1]
+    }
+}
+
+fn command(operation: u8, address: u8, data: u8) -> [u8; 4] {
+    [operation, address, data, !operation]
+}