Bluetooth Service
Overview
Bluetooth service uses the respective BlueZ package to connect to bluetooth devices
Verbs
| Name | Description | JSON Response |
|---|---|---|
| subscribe | subscribe to bluetooth events | Request: {"value": "device_changes"} |
| unsubscribe | unsubscribe to bluetooth events | Request: {"value": "device_changes"} |
| managed_objects | retrieve managed bluetooth devices | see managed_objects verb section |
| adapter_state | retrieve or change adapter scan settings | see adapter_state verb section |
| default_adapter | retrieve or change default adapter setting | Request: {"adapter": "hci1"} |
| avrcp_controls | avrcp controls for MediaPlayer1 playback | see avrcp_controls verb section |
| connect | connect to already paired device | see connect/disconnect verb section |
| disconnect | disconnect to already connected device | see connect/disconnect verb section |
| pair | initialize a pairing request | Request: {"device":"dev_88_0F_10_96_D3_20"} |
| cancel_pairing | cancel an outgoing pair request | |
| confirm_pairing | confirm incoming/outgoing bluetooth pairing pincode | Request: {"pincode": 31415} |
| remove_device | remove already paired device | Request: {"device": "dev_88_0F_10_96_D3_20"} |
managed_objects verb
This verb allows an client to get initial paired devices, and discovered unpaired devices before subscriptio to devices_changed event.
{
"response": {
"adapters": [
{
"name": "hci0",
"properties": {
"address": "00:1A:7D:DA:71:0F",
"powered": true,
"discoverable": true,
"discoverabletimeout": 180,
"pairable": true,
"pairabletimeout": 0,
"discovering": true,
"uuids": [
"00001112-0000-1000-8000-00805f9b34fb",
"00001801-0000-1000-8000-00805f9b34fb",
"0000110e-0000-1000-8000-00805f9b34fb",
"00001800-0000-1000-8000-00805f9b34fb",
"00001200-0000-1000-8000-00805f9b34fb",
"0000110c-0000-1000-8000-00805f9b34fb",
"0000110b-0000-1000-8000-00805f9b34fb",
"0000110a-0000-1000-8000-00805f9b34fb",
"0000111e-0000-1000-8000-00805f9b34fb",
"0000111f-0000-1000-8000-00805f9b34fb",
"00001108-0000-1000-8000-00805f9b34fb"
]
}
}
],
"devices": [
{
"adapter": "hci0",
"device": "dev_F8_34_41_DA_BA_46",
"properties": {
"address": "F8:34:41:DA:BA:46",
"name": "roguebox",
"alias": "roguebox",
"class": 1835276,
"icon": "computer",
"paired": false,
"trusted": false,
"blocked": false,
"legacypairing": false,
"rssi": -63,
"connected": false,
"uuids": [
"0000110e-0000-1000-8000-00805f9b34fb",
"0000110c-0000-1000-8000-00805f9b34fb",
"00001112-0000-1000-8000-00805f9b34fb",
"00001108-0000-1000-8000-00805f9b34fb",
"00001133-0000-1000-8000-00805f9b34fb",
"00001132-0000-1000-8000-00805f9b34fb",
"0000112f-0000-1000-8000-00805f9b34fb",
"00001104-0000-1000-8000-00805f9b34fb",
"00001106-0000-1000-8000-00805f9b34fb",
"00001105-0000-1000-8000-00805f9b34fb",
"0000110a-0000-1000-8000-00805f9b34fb",
"0000110b-0000-1000-8000-00805f9b34fb",
"00005005-0000-1000-8000-0002ee000001"
],
"modalias": "usb:v1D6Bp0246d0530",
"adapter": "/org/bluez/hci0",
"txpower": 12,
"servicesresolved": false
}
},
{
"adapter": "hci0",
"device": "dev_67_13_E2_57_29_0F",
"properties": {
"address": "68:13:E2:57:29:0F",
"alias": "67-13-E2-57-29-0F",
"paired": false,
"trusted": false,
"blocked": false,
"legacypairing": false,
"rssi": -69,
"connected": false,
"uuids": [],
"adapter": "/org/bluez/hci0",
"servicesresolved": false
}
},
],
"transports": [
{
"endpoint": "fd1",
"adapter": "hci0",
"device": "dev_D0_81_7A_5A_BC_5E",
"properties": {
"uuid": "0000110B-0000-1000-8000-00805F9B34FB",
"state": "idle",
"volume": 127
}
}
],
}
adapter_state verb
adapter_state verb allows setting and retrieving of requested adapter settings
| Name | Description |
|---|---|
| adapter | Must be the name of the adapter (i.e. hci0) |
| discovery | Discover nearby broadcasting devices |
| discoverable | Allow other devices to detect this device |
| powered | Adapter power state (optional, rfkill should be disabled already) |
adapter_state verb write-only parameters
| Name | Description |
|---|---|
| filter | Scan for devices only with respective UUIDS listed |
| transport | Scan for devices with only defined transport type (e.g. auto, bredr, le) |
avrcp_controls verb
avrcp_controls verb allow controlling the playback of the defined device
| Name | Description |
|---|---|
| adapter | Name of the adapter (i.e. hci0) |
| device | Must be the name of the device (i.e. dev_88_0F_10_96_D3_20) |
| action | Playback control action to take (e.g Play, Pause, Stop, Next, Previous, FastForward, Rewind) |
connect/disconnect verbs
NOTE: uuid in this respect is not related to the afb framework but the Bluetooth profile UUID
To connect/disconnect using the respective verb with all known and authenticated profiles:
{"device": "dev_88_0F_10_96_D3_20"}
To do the same for the respective device, verb, and for singular profile
{"device": "dev_88_0F_10_96_D3_20", "uuid": "0000110e-0000-1000-8000-00805f9b34fb"}
Events
| Name | Description | JSON Event Data |
|---|---|---|
| adapter_changes | report on Bluetooth adapter states | see adapter_changes event section |
| device_changes | report on Bluetooth devices | see device_changes event section |
| media | report on MediaPlayer1 events | see media event section |
| agent | PIN from BlueZ agent for confirmation | see agent event section |
adapter_changes event
Sample of adding new adapter event:
{
"adapter": "hci0",
"action": "added",
"properties": {
"address": "60:30:D4:66:55:A7",
"powered": false,
"discoverable": false,
"discoverabletimeout": 180,
"pairable": true,
"pairabletimeout": 0,
"discovering": false,
"uuids": [
"00001801-0000-1000-8000-00805f9b34fb",
"0000110e-0000-1000-8000-00805f9b34fb",
"00001200-0000-1000-8000-00805f9b34fb",
"00001800-0000-1000-8000-00805f9b34fb",
"0000111e-0000-1000-8000-00805f9b34fb",
"0000110c-0000-1000-8000-00805f9b34fb"
]
}
}
Sample of adapter property changes:
{
"adapter": "hci0",
"action": "changed",
"properties": {
"powered": false,
"discovering": false,
"discoverable": false
}
}
Sample of adapter being removed:
{
"adapter": "hci0",
"action": "removed",
}
device_changes event
Sample of discovering a new device event:
{
"adapter": "hci0",
"device": "dev_88_0F_10_96_D3_20",
"action": "added",
"properties": {
"address": "88:0F:10:96:D3:20",
"name": "MI_SCALE",
"alias": "MI_SCALE",
"class": 7995916,
"icon": "phone",
"paired": false,
"trusted": false,
"blocked": false,
"legacypairing": false,
"rssi": -55,
"connected": false,
"uuids": [
"00001200-0000-1000-8000-00805f9b34fb",
"0000111f-0000-1000-8000-00805f9b34fb",
"0000112f-0000-1000-8000-00805f9b34fb",
"0000110a-0000-1000-8000-00805f9b34fb",
"0000110c-0000-1000-8000-00805f9b34fb",
"00001116-0000-1000-8000-00805f9b34fb",
"00001132-0000-1000-8000-00805f9b34fb",
"00000000-deca-fade-deca-deafdecacafe",
"02030302-1d19-415f-86f2-22a2106a0a77",
"2d8d2466-e14d-451c-88bc-7301abea291a"
],
"adapter": "/org/bluez/hci0",
"servicesresolved": false
}
}
Changed status events for a device:
{
"adapter": "hci0",
"device": "dev_88_0F_10_96_D3_20",
"action": "changed",
"properties": {
"connected": true
}
}
media event
Playing audio reporting event (not all fields will be passed in every event):
{
"adapter": "hci0",
"device": "dev_D0_81_7A_5A_BC_5E",
"type": "playback",
"track": {
"title": "True Colors",
"duration": 228000,
"album": "True Colors",
"tracknumber": 6,
"artist": "Zedd",
"numberoftracks": 11,
"genre": "Dance & DJ/General"
},
"position": 5600,
"status": "playing",
"connected": true,
"player": "player0"
}
A2DP transport addition/removal (some fields are optional):
{
"adapter": "hci0",
"device": "dev_D0_81_7A_5A_BC_5E",
"action": "added",
"type": "transport",
"endpoint": "fd0"
"properties": {
"uuid": "0000110B-0000-1000-8000-00805F9B34FB",
"state": "idle",
"volume": 127
},
}
...
{
"adapter": "hci0",
"device": "dev_D0_81_7A_5A_BC_5E",
"action": "removed",
"type": "transport",
"endpoint": "fd0"
}
agent event
After pairing request agent will send event for a pincode that must be confirmed on both sides:
{
"adapter": "hci0",
"device": "dev_88_OF_10_96_D3_20",
"action": "request_confirmation",
"pincode": 327142
}
If pairing is canceled or fails:
{
"action": "canceled_pairing"
}