Getting a "GATT CONN TIMEOUT" message when trying to upload a new firmware via BLE DFU

[seanbites]

Thank you very much in advance for any help.

I am attempting to upload an example firmware on a nRF52832 with the s132 softdevice BLE stack and the example DFU bootloader. When I use the DFU toolbox provided with the nordic toolbox running on my nexus 5 with android 6.0.1, I am capable of pairing with the MCU (which is on the pca10040 dev board) but I am incapable of uploading a new firmware. I receive the following message: "GATT CONN TIMEOUT".

The firmware example I am uploading is "dfu_test_app_hrm_s132.zip" found at:

....\Workspace\nRF52_SDK_0.9.2_dbc28c9\examples\dfu\ble_dfu_send_hex\test_images_update_nrf52

and the bootloader I have placed in the device is "dual_bank_ble_s132" found at:

....\Workspace\nRF52_SDK_0.9.2_dbc28c9\examples\dfu\bootloader\pca10036\dual_bank_ble_s132\armgcc

Any help would be greatly appreciated and I can supply any other information necessary, if the need arises. I have tried to find similar posts or problems but have been unsuccessful. Thank you again!

[seanbites]

Haleluia! Thanks a lot for your help! I changed the parameters in dfu_transport_ble.c to

#define MIN_CONN_INTERVAL                    (uint16_t)(MSEC_TO_UNITS(15, UNIT_1_25_MS)) 
#define MAX_CONN_INTERVAL                    (uint16_t)(MSEC_TO_UNITS(500, UNIT_1_25_MS))

which is brute force and I'm going to have to figure out the optimal values for them so that the uploading is not so slow.

Update:

The following connection interval parameters works well

#define MIN_CONN_INTERVAL                    (uint16_t)(MSEC_TO_UNITS(15, UNIT_1_25_MS)) 
#define MAX_CONN_INTERVAL                    (uint16_t)(MSEC_TO_UNITS(100, UNIT_1_25_MS))

[seanbites]

We are developing a product which is supposed to work with all cell phones, so an issue with one model is to be considered serious. we will be doing our own tests as soon as we can on this model.