diff --git a/meshtastic/mesh.options b/meshtastic/mesh.options
index 4e335d2..76c4a40 100644
--- a/meshtastic/mesh.options
+++ b/meshtastic/mesh.options
@@ -67,6 +67,7 @@
 *NeighborInfo.neighbors max_count:10
 
 *DeviceMetadata.firmware_version max_size:18
+*DeviceMetadata.hw_env max_size:40
 
 *MqttClientProxyMessage.topic max_size:60
 *MqttClientProxyMessage.data max_size:435
diff --git a/meshtastic/mesh.proto b/meshtastic/mesh.proto
index ca3f6c6..9560593 100644
--- a/meshtastic/mesh.proto
+++ b/meshtastic/mesh.proto
@@ -1870,6 +1870,11 @@ message DeviceMetadata {
    * Has PKC capabilities
    */
   bool hasPKC = 11;
+  
+  /*
+   * Device firmware environment string
+   */
+  string pio_env = 12;
 }
 
 /*