diff --git a/Cargo.toml b/Cargo.toml
index f582a29..3596908 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,7 @@ opt-level = "z"
 pio = ["esp-idf-sys/pio"]
 
 [dependencies]
+anyhow = "1.0.57"
 embedded-hal = "0.2.7"
 esp-idf-hal = "0.37.4"
 esp-idf-sys = { version = "0.31.5", features = ["binstart"] }
diff --git a/src/command.rs b/src/command.rs
index 440cf8b..6de5fa6 100644
--- a/src/command.rs
+++ b/src/command.rs
@@ -1,5 +1,3 @@
-#[allow(dead_code)]
-
 use std::time::Duration;
 
 pub struct Command {
diff --git a/src/main.rs b/src/main.rs
index f00db07..36f1e2a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,11 +3,12 @@ mod modem;
 #[allow(dead_code)]
 mod command;
 
+use anyhow;
 use esp_idf_hal::prelude::*;
 use esp_idf_hal::peripherals::Peripherals;
 use esp_idf_hal::serial;
 
-fn main() {
+fn main() -> anyhow::Result<()> {
     esp_idf_sys::link_patches();
 
     let dp = Peripherals::take().unwrap();
@@ -36,15 +37,17 @@ fn main() {
     let modem_rst = dp.pins.gpio5.into_output().unwrap();
     let modem_power = dp.pins.gpio23.into_output().unwrap();
 
-    modem::init(modem_pwrkey, modem_rst, modem_power).unwrap();
+    modem::init(modem_pwrkey, modem_rst, modem_power)?;
 
     let (tx, rx) = serial.split();
     let mut mdm = modem::Modem::new(tx, rx);
 
-    let _ = mdm.modem_info().unwrap();
+    let _ = mdm.modem_info()?;
     let _ = mdm.connect_to_gprs_ap(
         config::A1_GPRS_AP.apn,
         config::A1_GPRS_AP.username,
         config::A1_GPRS_AP.password,
-    ).unwrap();
+    )?;
+
+    Ok(())
 }
diff --git a/src/modem.rs b/src/modem.rs
index d0f31f7..dd75eb2 100644
--- a/src/modem.rs
+++ b/src/modem.rs
@@ -2,6 +2,7 @@ use crate::command::Command;
 
 use std::iter::FromIterator;
 use std::thread;
+use std::error::Error;
 use std::time::{Duration, Instant};
 
 use embedded_hal::serial::{Read, Write};
@@ -21,6 +22,8 @@ pub enum ModemError {
     SetupError(String),
 }
 
+impl Error for ModemError {}
+
 impl std::fmt::Display for ModemError {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         write!(f, "{:?}", self)