I was upset early this afternoon because I was experiencing issues with buttonless DFU on Android. As is usually the case, I assumed it was my fault.
First, I reverted to old known working firmware/bootloader combinations. This was unsuccessful. After significant time trying different options, I used the ble_app_hrs on pca10028 s110 with dfu coupled with dual bank ble dfu for s110 on pca10028.
Both examples were lifted out of SDK9.
Everything works correctly with PC-based MCP. Could this be a problem with directed advertising?
EDIT
The upload SOMETIMES works using my application -- about a 30% success rate.
I also have some output from logcat (debugging nRF MCP on android 5.0.2)
11-17 10:47:50.378: E/DfuBaseService(27070): An error occurred while connecting to the device:133
This is after buttonless initiation -- when the android device tries to reconnect with the application in bootloader mode.
Here is an example of looping trying to start DFU
V 12:45:37.576 [DFU] Starting DFU service
V 12:45:37.598 [DFU] Opening file...
I 12:45:37.618 [DFU] Image file opened (21696 bytes in total)
V 12:45:37.633 [DFU] Connecting to DFU target...
D 12:45:37.969 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED
I 12:45:41.971 [DFU] Connected. Services discovered
V 12:45:42.005 [DFU] Reading DFU version number...
I 12:45:42.036 [DFU] Read Response received from 00001534-1212-efde-1523-785feabcd123, value (0x): 01-00
A 12:45:42.055 [DFU] Version number read: 0.1
W 12:45:42.071 [DFU] Application with buttonless update found
V 12:45:42.086 [DFU] Reading Service Changed CCCD value...
V 12:45:42.134 [DFU] Enabling indications for 00002a05-0000-1000-8000-00805f9b34fb
D 12:45:42.152 [DFU] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x02-00)
A 12:45:42.211 [DFU] Service Changed indications enabled
V 12:45:42.255 [DFU] Restarting service...
V 12:45:42.272 [DFU] Disconnecting...
I 12:45:42.290 [DFU] Disconnected
D 12:45:42.309 [DFU] gatt.close()
D 12:45:42.358 [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED
V 12:45:42.419 [DFU] Starting DFU service
V 12:45:42.437 [DFU] Opening file...
I 12:45:42.470 [DFU] Image file opened (21696 bytes in total)
V 12:45:42.487 [DFU] Connecting to DFU target...
D 12:45:42.964 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED
I 12:45:44.572 [DFU] Connected. Services discovered
V 12:45:44.593 [DFU] Reading DFU version number...
I 12:45:44.682 [DFU] Read Response received from 00001534-1212-efde-1523-785feabcd123, value (0x): 01-00
A 12:45:44.697 [DFU] Version number read: 0.1
W 12:45:44.713 [DFU] Application with buttonless update found
V 12:45:44.728 [DFU] Reading Service Changed CCCD value...
V 12:45:44.790 [DFU] Enabling indications for 00002a05-0000-1000-8000-00805f9b34fb
D 12:45:44.824 [DFU] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x02-00)
A 12:45:44.875 [DFU] Service Changed indications enabled
V 12:45:44.898 [DFU] Restarting service...
V 12:45:44.967 [DFU] Disconnecting...
I 12:45:44.987 [DFU] Disconnected
D 12:45:45.005 [DFU] gatt.close()
D 12:45:45.036 [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED
V 12:45:45.078 [DFU] Starting DFU service
V 12:45:45.095 [DFU] Opening file...
I 12:45:45.134 [DFU] Image file opened (21696 bytes in total)
V 12:45:45.149 [DFU] Connecting to DFU target...
D 12:45:45.630 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED
I 12:45:47.259 [DFU] Connected. Services discovered
V 12:45:47.296 [DFU] Reading DFU version number...
I 12:45:47.370 [DFU] Read Response received from 00001534-1212-efde-1523-785feabcd123, value (0x): 01-00
A 12:45:47.385 [DFU] Version number read: 0.1
W 12:45:47.401 [DFU] Application with buttonless update found
V 12:45:47.416 [DFU] Reading Service Changed CCCD value...
V 12:45:47.461 [DFU] Enabling indications for 00002a05-0000-1000-8000-00805f9b34fb
D 12:45:47.477 [DFU] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x02-00)
A 12:45:47.557 [DFU] Service Changed indications enabled
V 12:45:47.572 [DFU] Restarting service...
V 12:45:47.590 [DFU] Disconnecting...
I 12:45:47.607 [DFU] Disconnected
D 12:45:47.629 [DFU] gatt.close()
D 12:45:47.735 [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED
V 12:45:47.751 [DFU] Starting DFU service
V 12:45:47.766 [DFU] Opening file...
I 12:45:47.782 [DFU] Image file opened (21696 bytes in total)
V 12:45:47.802 [DFU] Connecting to DFU target...
W 12:45:47.822 [DFU] Connected. DFU Service not found
D 12:45:47.837 [DFU] gatt.close()
V 12:45:47.853 Connecting to CB:B8:77:F6:7A:BE...
D 12:45:47.868 gatt = device.connectGatt(autoConnect = false)
D 12:45:48.289 [Callback] Connection state changed with status: 0 and new state: CONNECTED (2)
D 12:45:48.309 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED
I 12:45:48.326 Connected to CB:B8:77:F6:7A:BE
D 12:45:48.348 wait(600ms)
V 12:45:48.985 Discovering Services...
D 12:45:49.014 gatt.discoverServices()
D 12:45:49.047 [Callback] Services discovered with status: 0
I 12:45:49.073 Services Discovered
EDIT
Please find attached 3 files. One contains a successful update, one contains an unsuccessful update, and another contains 3 unsuccessful updates followed by a successful update. All of which were updating my application to the same version of my application using the stock bootloader and MCP android 3.4.1
It seems as if the 'enter bootloader characteristics' are not being written before link termination for unsuccessful updates, resulting in a failure to enter bootloader mode before reconnection.
Unsuccessful update from myapp to myapp
successful update from myapp to myapp
three unsuccessful updates then a successful one from myapp to myapp
EDIT
Using MCP 3.9.0.6 I get a 100% update success rate, which points me to an issue on the mobile side. This is good because it indicates to me the problem does not lie with the firmware, but my co-workers and our partners without development dongles prefer to use the mobile app.
