Support new way of read serial number from SoC (#341)

* Support new way of read serial number from SoC

* Update config.json

* Update CHANGELOG.md

* Update run.sh

* Update run.sh

bluetooth_bcm43xx/CHANGELOG.md

@@ -1,5 +1,8 @@
 # Changelog
 
+## 2.1
+- Support new way to read `serial-number` from device-tree
+
 ## 2.0
 - Update Firmware blobs
 

bluetooth_bcm43xx/config.json

@@ -1,12 +1,13 @@
 {
   "name": "Bluetooth BCM43xx",
-  "version": "2.0",
+  "version": "2.1",
   "slug": "bluetooth_bcm43xx",
   "description": "Activate Bluetooth for Broadcom 43xx chips",
   "url": "https://home-assistant.io/addons/bluetooth_bcm43xx/",
   "startup": "initialize",
   "boot": "auto",
-  "host_network": "true",
+  "host_network": true,
+  "devicetree": true,
   "privileged": ["NET_ADMIN"],
   "devices": ["/dev/ttyAMA0:/dev/ttyAMA0:rwm"],
   "options": {},

bluetooth_bcm43xx/run.sh

@@ -1,7 +1,14 @@
 #!/bin/bash
 set -e
 
-SERIAL="$(grep Serial /proc/cpuinfo | cut -c19-)"
+# Read serial number
+if [ -e /proc/device-tree/serial-number ]; then
+    SERIAL="$(cut -c9- /proc/device-tree/serial-number)"
+else
+    SERIAL="$(grep Serial /proc/cpuinfo | cut -c19-)"
+fi
+
+# Generate MAC
 B1="$(echo "$SERIAL" | cut -c3-4)"
 B2="$(echo "$SERIAL" | cut -c5-6)"
 B3="$(echo "$SERIAL" | cut -c7-8)"