diff --git a/src/core/config.rs b/src/core/config.rs
index 5a09502..cdac870 100644
--- a/src/core/config.rs
+++ b/src/core/config.rs
@@ -1,13 +1,5 @@
 use std::time::Duration;
 
-const DEFAULT_MAX_CONCURRENT_EXECUTIONS: usize = 16;
-const DEFAULT_MAX_CONNECTED_DEVICES: usize = 10;
-const DEFAULT_MAX_EXECUTION_SECS: u64 = 3600;
-const DEFAULT_MAX_COMMAND_LENGTH: usize = 65_536;
-const DEFAULT_MAX_RESULT_BYTES: usize = 10 * 1024 * 1024;
-const DEFAULT_PING_INTERVAL_SECS: u64 = 30;
-const DEFAULT_PING_TIMEOUT_SECS: u64 = 10;
-
 pub struct Config {
     pub max_concurrent_executions: usize,
     pub max_connected_devices: usize,
@@ -19,29 +11,37 @@ pub struct Config {
 }
 
 impl Config {
+    const DEFAULT_MAX_CONCURRENT_EXECUTIONS: usize = 16;
+    const DEFAULT_MAX_CONNECTED_DEVICES: usize = 10;
+    const DEFAULT_MAX_EXECUTION_SECS: u64 = 3600;
+    const DEFAULT_MAX_COMMAND_LENGTH: usize = 65_536;
+    const DEFAULT_MAX_RESULT_BYTES: usize = 10 * 1024 * 1024;
+    const DEFAULT_PING_INTERVAL_SECS: u64 = 30;
+    const DEFAULT_PING_TIMEOUT_SECS: u64 = 10;
+
     pub fn from_env() -> Self {
         Self {
             max_concurrent_executions: parse_env(
                 "MAX_CONCURRENT_EXECUTIONS",
-                DEFAULT_MAX_CONCURRENT_EXECUTIONS,
+                Self::DEFAULT_MAX_CONCURRENT_EXECUTIONS,
             ),
             max_connected_devices: parse_env(
                 "MAX_CONNECTED_DEVICES",
-                DEFAULT_MAX_CONNECTED_DEVICES,
+                Self::DEFAULT_MAX_CONNECTED_DEVICES,
             ),
             max_execution_time: Duration::from_secs(parse_env(
                 "MAX_EXECUTION_SECS",
-                DEFAULT_MAX_EXECUTION_SECS,
+                Self::DEFAULT_MAX_EXECUTION_SECS,
             )),
-            max_command_length: parse_env("MAX_COMMAND_LENGTH", DEFAULT_MAX_COMMAND_LENGTH),
-            max_result_bytes: parse_env("MAX_RESULT_BYTES", DEFAULT_MAX_RESULT_BYTES),
+            max_command_length: parse_env("MAX_COMMAND_LENGTH", Self::DEFAULT_MAX_COMMAND_LENGTH),
+            max_result_bytes: parse_env("MAX_RESULT_BYTES", Self::DEFAULT_MAX_RESULT_BYTES),
             ping_interval: Duration::from_secs(parse_env(
                 "PING_INTERVAL_SECS",
-                DEFAULT_PING_INTERVAL_SECS,
+                Self::DEFAULT_PING_INTERVAL_SECS,
             )),
             ping_timeout: Duration::from_secs(parse_env(
                 "PING_TIMEOUT_SECS",
-                DEFAULT_PING_TIMEOUT_SECS,
+                Self::DEFAULT_PING_TIMEOUT_SECS,
             )),
         }
     }