From f76a4b7f83de9ad1ff56ec3a624fef243d4e2bfc Mon Sep 17 00:00:00 2001
From: Orne Brocaar <info@brocaar.com>
Date: Thu, 11 Jul 2024 10:05:23 +0100
Subject: [PATCH] lrwn: Allow empty string for AES128Key, DevAddr, EUI64 and
 NetID.

In case an empty string is provided, the default "null" value will be
used.

Fixes #453.
---
 lrwn/src/aes128.rs  | 4 +++-
 lrwn/src/devaddr.rs | 4 +++-
 lrwn/src/eui64.rs   | 4 +++-
 lrwn/src/netid.rs   | 4 +++-
 4 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/lrwn/src/aes128.rs b/lrwn/src/aes128.rs
index f35387fd..200bdb0d 100644
--- a/lrwn/src/aes128.rs
+++ b/lrwn/src/aes128.rs
@@ -62,7 +62,9 @@ impl FromStr for AES128Key {
     type Err = Error;
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         let mut bytes: [u8; 16] = [0; 16];
-        hex::decode_to_slice(s, &mut bytes)?;
+        if !s.is_empty() {
+            hex::decode_to_slice(s, &mut bytes)?;
+        }
         Ok(AES128Key(bytes))
     }
 }
diff --git a/lrwn/src/devaddr.rs b/lrwn/src/devaddr.rs
index c0e01e2c..f5293a6e 100644
--- a/lrwn/src/devaddr.rs
+++ b/lrwn/src/devaddr.rs
@@ -234,7 +234,9 @@ impl FromStr for DevAddr {
     type Err = Error;
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         let mut bytes: [u8; 4] = [0; 4];
-        hex::decode_to_slice(s, &mut bytes)?;
+        if !s.is_empty() {
+            hex::decode_to_slice(s, &mut bytes)?;
+        }
         Ok(DevAddr(bytes))
     }
 }
diff --git a/lrwn/src/eui64.rs b/lrwn/src/eui64.rs
index 2c1972a5..f1235989 100644
--- a/lrwn/src/eui64.rs
+++ b/lrwn/src/eui64.rs
@@ -70,7 +70,9 @@ impl FromStr for EUI64 {
     type Err = Error;
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         let mut bytes: [u8; 8] = [0; 8];
-        hex::decode_to_slice(s, &mut bytes)?;
+        if !s.is_empty() {
+            hex::decode_to_slice(s, &mut bytes)?;
+        }
         Ok(EUI64(bytes))
     }
 }
diff --git a/lrwn/src/netid.rs b/lrwn/src/netid.rs
index deccb272..6624a49b 100644
--- a/lrwn/src/netid.rs
+++ b/lrwn/src/netid.rs
@@ -129,7 +129,9 @@ impl FromStr for NetID {
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         let mut bytes: [u8; 3] = [0; 3];
-        hex::decode_to_slice(s, &mut bytes)?;
+        if !s.is_empty() {
+            hex::decode_to_slice(s, &mut bytes)?;
+        }
 
         Ok(NetID(bytes))
     }