backend/bitbox02: automatically upgrade ble fw for testing

Author: benma

backend/devices/bitbox02/assets/da14531-firmware.bin

@@ -0,0 +1,28 @@
+// Copyright 2025 Shift Crypto AG
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package bitbox02
+
+import (
+	"crypto/sha256"
+	_ "embed" // Needed for the go:embed directive below.
+)
+
+//go:embed assets/da14531-firmware.bin
+var bluetoothFirmware []byte
+
+func bundledBluetoothFirmwareHash() []byte {
+	hash := sha256.Sum256(bluetoothFirmware)
+	return hash[:]
+}

backend/devices/bitbox02/bluetooth.go

@@ -17,6 +17,8 @@
 package bitbox02
 
 import (
+	"encoding/hex"
+
 	deviceevent "github.com/BitBoxSwiss/bitbox-wallet-app/backend/devices/device/event"
 	keystoreInterface "github.com/BitBoxSwiss/bitbox-wallet-app/backend/keystore"
 	"github.com/BitBoxSwiss/bitbox-wallet-app/util/logging"
@@ -90,6 +92,27 @@ func NewDevice(
 					Subject: string(deviceevent.EventKeystoreAvailable),
 					Action:  action.Replace,
 				})
+
+			}
+		}
+
+		// Temporary automatic Bluetooth firmware upgrade during the testing phase. We prompt an
+		// upgrade every time if the bundled firmware does not match the actual firmware on the
+		// device.  TODO: remove before production release.
+		if ev == firmware.EventStatusChanged && device.SupportsBluetooth() {
+			switch device.Device.Status() {
+			case firmware.StatusInitialized, firmware.StatusUninitialized:
+				info, err := device.DeviceInfo()
+				if err != nil {
+					device.log.WithError(err).Error("DeviceInfo")
+					return
+				}
+				if info.Bluetooth != nil &&
+					info.Bluetooth.FirmwareHash != hex.EncodeToString(bundledBluetoothFirmwareHash()) {
+					if err := device.BluetoothUpgrade(bluetoothFirmware); err != nil {
+						device.log.WithError(err).Error("BluetoothUpgrade")
+					}
+				}
 			}
 		}
 	})