From c594cf1e8bd8c0bef1b0d4be283116ebc581888f Mon Sep 17 00:00:00 2001
From: Alex Janka <alex@alexjanka.com>
Date: Mon, 5 Sep 2022 09:30:24 +1000
Subject: [PATCH] packaging etc

---
 Cargo.lock  |  2 +-
 Cargo.toml  |  2 +-
 install.sh  |  1 +
 src/main.rs | 10 ++++++++++
 4 files changed, 13 insertions(+), 2 deletions(-)
 create mode 100755 install.sh

diff --git a/Cargo.lock b/Cargo.lock
index 249b11e..97a2d30 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -382,7 +382,7 @@ dependencies = [
 ]
 
 [[package]]
-name = "modbus-test"
+name = "mppt-control"
 version = "0.1.0"
 dependencies = [
  "bincode",
diff --git a/Cargo.toml b/Cargo.toml
index b3d0f66..9cfd693 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "modbus-test"
+name = "mppt-control"
 version = "0.1.0"
 edition = "2021"
 
diff --git a/install.sh b/install.sh
new file mode 100755
index 0000000..80d5eab
--- /dev/null
+++ b/install.sh
@@ -0,0 +1 @@
+git pull && cargo install --path .
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 1771f61..f89efd2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,5 @@
+use std::path::Path;
+
 use clap::Parser;
 use libmodbus_rs::{Modbus, ModbusClient, ModbusRTU};
 use serde::{Deserialize, Serialize};
@@ -125,6 +127,7 @@ struct Info {
     v_scale: f32,
     i_scale: f32,
 }
+
 impl Info {
     pub fn from(data: &[u16]) -> Self {
         Self {
@@ -155,6 +158,13 @@ fn main() {
     let parity = 'N';
     let data_bit = 8;
     let stop_bit = 2;
+    if !Path::new(&args.serial_port).exists() {
+        println!(
+            "Serial port {} does not exist\nTry \"mppt-control --help\" for usage instructions",
+            args.serial_port
+        );
+        return;
+    }
     println!("Connecting to device on {}", args.serial_port);
     let mut modbus = Modbus::new_rtu(&args.serial_port, baud, parity, data_bit, stop_bit)
         .expect("Could not create modbus device");