Here is how the log looks like. I powered the device precisely at 45:00, and ~5s after the it blinked
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] Device state changed response: [<DeviceState.128|APSDE_DATA_REQUEST_SLOTS_AVAILABLE|APSDE_DATA_INDICATION|2: 170>, 0]
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_indication (1, 1)
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] APS data indication response: [35, <DeviceState.APSDE_DATA_REQUEST_SLOTS_AVAILABLE|2: 34>, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0xfffd>, 0, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, 0, 0, 19, b'\x00\x0f\x07/\xf0\xb0\x00\xaa>\xb0|\x8e', 0, 175, 255, 221, 58, 2, 0, -57]
2021-03-19 16:45:00 INFO (MainThread) [zigpy_deconz.zigbee.application] New device joined: 0x070f, 7c:b0:3e:aa:00:b0:f0:2f
2021-03-19 16:45:00 INFO (MainThread) [zigpy.application] Device 0x070f (7c:b0:3e:aa:00:b0:f0:2f) joined the network
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy.application] Skip initialization for existing device 7c:b0:3e:aa:00:b0:f0:2f
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy.zdo] [0x070f:zdo] ZDO request ZDOCmd.Device_annce: [0x070F, 7c:b0:3e:aa:00:b0:f0:2f, 142]
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.zigbee.application] Sending Zigbee request with tsn 129 under 130 request id, data: b'01810200'
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] 'aps_data_indication' response from <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, ep: 0, profile: 0x0000, cluster_id: 0x0013, data: b'000f072ff0b000aa3eb07c8e'
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_request (19, 130, 0, <DeconzAddressEndpoint address_mode=2 address=0x070F endpoint=3>, 260, 4, 1, b'\x01\x81\x02\x00', 2, 0)
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] APS data request response: [2, <DeviceState.APSDE_DATA_REQUEST_SLOTS_AVAILABLE|2: 34>, 130]
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] Device state changed response: [<DeviceState.128|APSDE_DATA_REQUEST_SLOTS_AVAILABLE|APSDE_DATA_CONFIRM|2: 166>, 0]
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_confirm (0,)
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] APS data confirm response for request with id 130: 00
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] Request id: 0x82 'aps_data_confirm' for <DeconzAddressEndpoint address_mode=ADDRESS_MODE.NWK address=0x070f endpoint=3>, status: 0x00
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] Device state changed response: [<DeviceState.128|APSDE_DATA_REQUEST_SLOTS_AVAILABLE|APSDE_DATA_INDICATION|2: 170>, 0]
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_indication (1, 1)
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] APS data indication response: [30, <DeviceState.APSDE_DATA_REQUEST_SLOTS_AVAILABLE|2: 34>, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x0000>, 1, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, 3, 260, 4, b'\x19\x81\x02\x07\x01\x02\x00', 0, 175, 255, 176, 58, 2, 0, -57]
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy.zcl] [0x070f:3:0x0004] ZCL deserialize: <ZCLHeader frame_control=<FrameControl frame_type=CLUSTER_COMMAND manufacturer_specific=False is_reply=True disable_default_response=True> manufacturer=None tsn=129 command_id=2>
2021-03-19 16:45:00 DEBUG (MainThread) [zigpy_deconz.api] 'aps_data_indication' response from <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, ep: 3, profile: 0x0104, cluster_id: 0x0004, data: b'19810207010200'
2021-03-19 16:45:05 DEBUG (MainThread) [zigpy_deconz.api] Device state changed response: [<DeviceState.128|APSDE_DATA_REQUEST_SLOTS_AVAILABLE|APSDE_DATA_INDICATION|2: 170>, 0]
2021-03-19 16:45:05 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_indication (1, 1)
2021-03-19 16:45:05 DEBUG (MainThread) [zigpy_deconz.api] APS data indication response: [30, <DeviceState.APSDE_DATA_REQUEST_SLOTS_AVAILABLE|2: 34>, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x0000>, 1, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, 3, 260, 6, b'\x18\x00\n\x00\x00\x10\x01', 0, 175, 255, 224, 58, 2, 0, -57]
2021-03-19 16:45:05 DEBUG (MainThread) [zigpy.zcl] [0x070f:3:0x0006] ZCL deserialize: <ZCLHeader frame_control=<FrameControl frame_type=GLOBAL_COMMAND manufacturer_specific=False is_reply=True disable_default_response=True> manufacturer=None tsn=0 command_id=Command.Report_Attributes>
2021-03-19 16:45:05 DEBUG (MainThread) [zigpy.zcl] [0x070f:3:0x0006] ZCL request 0x000a: [[Attribute(attrid=0, value=<TypeValue type=Bool, value=Bool.true>)]]
2021-03-19 16:45:05 DEBUG (MainThread) [zigpy.zcl] [0x070f:3:0x0006] Attribute report received: on_off=1
2021-03-19 16:45:05 DEBUG (MainThread) [zigpy_deconz.api] 'aps_data_indication' response from <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, ep: 3, profile: 0x0104, cluster_id: 0x0006, data: b'18000a00001001'
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] Device state changed response: [<DeviceState.128|APSDE_DATA_REQUEST_SLOTS_AVAILABLE|APSDE_DATA_INDICATION|2: 170>, 0]
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_indication (1, 1)
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] APS data indication response: [30, <DeviceState.APSDE_DATA_REQUEST_SLOTS_AVAILABLE|2: 34>, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x0000>, 1, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, 3, 260, 8, b'\x18\x01\n\x00\x00 \xfe', 0, 175, 255, 224, 58, 2, 0, -56]
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy.zcl] [0x070f:3:0x0008] ZCL deserialize: <ZCLHeader frame_control=<FrameControl frame_type=GLOBAL_COMMAND manufacturer_specific=False is_reply=True disable_default_response=True> manufacturer=None tsn=1 command_id=Command.Report_Attributes>
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy.zcl] [0x070f:3:0x0008] ZCL request 0x000a: [[Attribute(attrid=0, value=<TypeValue type=uint8_t, value=254>)]]
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy.zcl] [0x070f:3:0x0008] Attribute report received: current_level=254
2021-03-19 16:45:06 DEBUG (MainThread) [homeassistant.components.zha.core.channels.base] [0x070F:3:0x0008]: received attribute: 0 update with value: 254
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] 'aps_data_indication' response from <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, ep: 3, profile: 0x0104, cluster_id: 0x0008, data: b'18010a000020fe'
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] Device state changed response: [<DeviceState.128|APSDE_DATA_REQUEST_SLOTS_AVAILABLE|APSDE_DATA_INDICATION|2: 170>, 0]
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_indication (1, 1)
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] APS data indication response: [32, <DeviceState.APSDE_DATA_REQUEST_SLOTS_AVAILABLE|2: 34>, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0xfffd>, 0, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, 0, 0, 6, b'\x01\xfd\xff\x04\x01\x01\x19\x00\x00', 0, 175, 255, 224, 58, 2, 0, -56]
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy.zdo] [0x070f:zdo] ZDO request ZDOCmd.Match_Desc_req: [0xFFFD, 260, [25], []]
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.zigbee.application] Sending Zigbee request with tsn 1 under 131 request id, data: b'010000000101'
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] 'aps_data_indication' response from <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, ep: 0, profile: 0x0000, cluster_id: 0x0006, data: b'01fdff040101190000'
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_request (21, 131, 0, <DeconzAddressEndpoint address_mode=2 address=0x070F endpoint=0>, 0, <ZDOCmd.Match_Desc_rsp: 0x8006>, 0, b'\x01\x00\x00\x00\x01\x01', 2, 0)
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] APS data request response: [2, <DeviceState.APSDE_DATA_REQUEST_SLOTS_AVAILABLE|2: 34>, 131]
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] Device state changed response: [<DeviceState.128|APSDE_DATA_REQUEST_SLOTS_AVAILABLE|APSDE_DATA_INDICATION|APSDE_DATA_CONFIRM|2: 174>, 0]
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_indication (1, 1)
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] APS data indication response: [28, <DeviceState.APSDE_DATA_REQUEST_SLOTS_AVAILABLE|APSDE_DATA_CONFIRM|2: 38>, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x0000>, 0, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, 0, 0, 1, b'\x02\x00\x00\x00\x00', 0, 175, 255, 176, 58, 2, 0, -56]
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy.zdo] [0x070f:zdo] ZDO request ZDOCmd.IEEE_addr_req: [0x0000, 0, 0]
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.zigbee.application] Sending Zigbee request with tsn 2 under 132 request id, data: b'0200e52106ffff2e210000000000'
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] 'aps_data_indication' response from <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, ep: 0, profile: 0x0000, cluster_id: 0x0001, data: b'0200000000'
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_confirm (0,)
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] Device state changed response: [<DeviceState.128|APSDE_DATA_REQUEST_SLOTS_AVAILABLE|APSDE_DATA_INDICATION|APSDE_DATA_CONFIRM|2: 174>, 0]
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] APS data confirm response for request with id 131: 00
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] Request id: 0x83 'aps_data_confirm' for <DeconzAddressEndpoint address_mode=ADDRESS_MODE.NWK address=0x070f endpoint=0>, status: 0x00
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_request (29, 132, 0, <DeconzAddressEndpoint address_mode=2 address=0x070F endpoint=0>, 0, <ZDOCmd.IEEE_addr_rsp: 0x8001>, 0, b'\x02\x00\xe5!\x06\xff\xff.!\x00\x00\x00\x00\x00', 2, 0)
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] APS data request response: [2, <DeviceState.APSDE_DATA_REQUEST_SLOTS_AVAILABLE|APSDE_DATA_INDICATION|2: 42>, 132]
2021-03-19 16:45:06 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_indication (1, 1)
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.api] APS data indication response: [28, <DeviceState.APSDE_DATA_REQUEST_SLOTS_AVAILABLE|2: 34>, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x0000>, 0, <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, 0, 0, 1, b'\x03\x00\x00\x00\x00', 0, 175, 255, 227, 58, 2, 0, -56]
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy.zdo] [0x070f:zdo] ZDO request ZDOCmd.IEEE_addr_req: [0x0000, 0, 0]
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.zigbee.application] Sending Zigbee request with tsn 3 under 133 request id, data: b'0300e52106ffff2e210000000000'
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.api] 'aps_data_indication' response from <DeconzAddress address_mode=ADDRESS_MODE.NWK address=0x070f>, ep: 0, profile: 0x0000, cluster_id: 0x0001, data: b'0300000000'
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_request (29, 133, 0, <DeconzAddressEndpoint address_mode=2 address=0x070F endpoint=0>, 0, <ZDOCmd.IEEE_addr_rsp: 0x8001>, 0, b'\x03\x00\xe5!\x06\xff\xff.!\x00\x00\x00\x00\x00', 2, 0)
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.api] Device state changed response: [<DeviceState.128|APSDE_DATA_REQUEST_SLOTS_AVAILABLE|APSDE_DATA_CONFIRM|2: 166>, 0]
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.api] APS data request response: [2, <DeviceState.APSDE_DATA_REQUEST_SLOTS_AVAILABLE|APSDE_DATA_CONFIRM|2: 38>, 133]
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_confirm (0,)
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.api] APS data confirm response for request with id 132: e9
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.api] Request id: 0x84 'aps_data_confirm' for <DeconzAddressEndpoint address_mode=ADDRESS_MODE.NWK address=0x070f endpoint=0>, status: 0xe9
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.zigbee.application] Error while sending 132 req id frame: TXStatus.MAC_NO_ACK
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy.device] [0x070f] Delivery error for seq # 0x02, on endpoint id 0 cluster 0x8001: message send failure
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.api] Device state changed response: [<DeviceState.128|APSDE_DATA_REQUEST_SLOTS_AVAILABLE|APSDE_DATA_CONFIRM|2: 166>, 0]
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.api] Command Command.aps_data_confirm (0,)
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.api] APS data confirm response for request with id 133: e9
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.api] Request id: 0x85 'aps_data_confirm' for <DeconzAddressEndpoint address_mode=ADDRESS_MODE.NWK address=0x070f endpoint=0>, status: 0xe9
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy_deconz.zigbee.application] Error while sending 133 req id frame: TXStatus.MAC_NO_ACK
2021-03-19 16:45:07 DEBUG (MainThread) [zigpy.device] [0x070f] Delivery error for seq # 0x03, on endpoint id 0 cluster 0x8001: message send failure