SDK 13.0.0 Buttonless DFU won't enter boot mode

[Mark P. Mendelsohn]

Starting notification and then writing 0x01 to the control point does not cause the Buttonless DFU to enter boot mode. LED #1 remains on.

Run time trace show:

APP:INFO:advertising is started
APP:INFO:Connected
APP:INFO:Received indication state 0, notification state 1

Log from LightBlue shows:

17:39:26.322 — Connected to nearby peripheral: Nordic_Buttonless
17:39:26.948 — Discovered nearby peripheral: (null) (RSSI: -94)
17:39:27.291 — Stopping search for nearby peripherals
17:39:36.236 — Characteristic (8EC90003-F315-4F60-9FB8-838830DAEA50) wrote new value: <01>
17:39:39.325 — Starting search for nearby peripherals
17:39:39.840 — Disconnecting from nearby peripheral: Nordic_Buttonless
17:39:39.854 — Disconnected from nearby peripheral Nordic_Buttonless
17:39:40.455 — Discovered nearby peripheral: (null) (RSSI: -78)
17:39:40.515 — Stopping search for nearby peripherals

[Mark P. Mendelsohn]

Root cause is no BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST gets generated despite the fact wr_auth is set.

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156 char_uuid.type = p_dfu->uuid_type;

157 char_uuid.uuid = BLE_DFU_BUTTONLESS_CHAR_UUID;

158

159 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm);

160 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);

161

162 attr_md.vloc = BLE_GATTS_VLOC_STACK;

163 attr_md.rd_auth = 0;

164 attr_md.wr_auth = 1;

165 attr_md.vlen = 1;

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Trace

APP:INFO:advertising is started
APP:INFO:Connected
:INFO:ble_dfu_on_ble_evt 10
:INFO:ble_dfu_on_ble_evt 21
:INFO:ble_dfu_on_ble_evt 22
:INFO:ble_dfu_on_ble_evt 55
:INFO:ble_dfu_on_ble_evt 50
:INFO:on_write
:INFO:ble_dfu_on_ble_evt 52
:INFO:ble_dfu_on_ble_evt 12
:INFO:ble_dfu_on_ble_evt 50