1. JdPlaySS protocol

1.1. Usage scenario

Use network protocols to control the background sound host, support local area network discovery and control of the background sound host, open up local and scene music resources and control, mainly used for Linux/RTOS gateway.

1.2. Overview

JdPlaySS is the abbreviation of JdPlay Server socket. It refers to the ideas of mqtt and DLNA protocols. It is a simple server socket based on the TCP protocol. It can be used for LAN background sound system control under non-Android/iOS systems (such as Linux gateway), and can support multiple clients to connect at the same time.

1.3. Interactive diagram

1.4. Conditions & Constraints

The C/S transmission data format adopts json, and the newline character is used as the message separator. Therefore, it is not allowed to have actual newline characters in the message, but escaped newline characters can exist.

1.5. Discover protocol

Device discovery adopts the device discovery mechanism of DLNA. The Client joins the unicast group and sends the SSDP M-SEARCH packet to the unicast address 239.255.255.250:1900 port, or it can directly send the SSDP M-SEARCH broadcast packet to the broadcast address of the current local area network (such as 192.168.1.255). Refer to the M-SEARCH package data as follows： M-SEARCH HTTP/1.1 MX: 2 ST: upnp:rootdevice MAN: "ssdp:discover" User-Agent: UPnP/1.0 DLNADOC/1.50 JdPlay/1.0.0 Connection: close Host: 239.255.255.250:1900 The client listens to the SSDP NOTIFY package, and if the parsing package contains the EXT field and the field contains the'JDPLAY' keyword, the background sound system is found. If the version number is greater than XXX, it can be controlled through this agreement. Refer to the NOTIFY package data as follows： NOTIFY HTTP/1.1

Host: 239.255.255.250:1900

Location: http://192.168.1.154:1500/
Cache-Control: max-age=100
Server: UPnP/1.0 DLNADOC/1.50 EglPlay/1.0.0
BOOTID.UPNP.ORG: 1490004021
EXT: JDPLAY/2.1.1
NTS: ssdp:alive
USN: uuid:10000003816::urn:schemas-upnp-org:device:MediaRenderer:1

NT: urn:schemas-upnp-org:device:MediaRenderer:1

1.6. Control protocol


### Message format

C/S direct data transfer uses the following fields, note that seq=0 is reserved for the active feedback of server-side messages.

{

    "type": [int][Required] control package type,
    "seq": [int][optional] Control package serial number,
    "s0": [string][optional] String parameter 0,
    "s1": [string][optional] String parameter 1,
    "i0": [int][optional] Shaping parameter 0,
    "i1": [int] [optional] Shaping parameter 1,

1.6.1. Message type

There are several types of message packets

type type value	transmission direction	description
1	C-> S	CONNECT: Connection request
2	S-> C	CONNACK: Connection response
3	C->S S-> C	PUBLISH: Publish news
4	C->S S-> C	PUBACK: Release message confirmation
12	C-> S	PINGREQ: Heartbeat request
13	S-> C	PINGRESP: Heartbeat feedback
14	C-> S	DISCONNECT: DISCONNECT request

1.6.2. Message description

CONNECT

i0: version Client protocol version, this agreement is 1
i1: keepalive heartbeat packet time, unit second, range (10~600 seconds), the recommended value is 300, the client sends a heartbeat packet or transmits data every 240 seconds.

CONNACK

i0: version Server-side protocol version, this agreement is 1
i1:0: Success -1: Failure
s0: Feedback message string for debugging

PUBLISH

Used for messaging between C/S, it currently supports two types of messages, control messages (C->S) and status active (S->C) feedback messages. When the client sends A message to the server, the server will reply to the PUBACK message; when the server actively feedback the message to the client, the client does not need to reply to the PUBACK message.

seq: [Required] Message serial number, incremented from 1 (0: Reserved for Server messages to be actively sent)
i0: [Required] cmd command, the supported commands and parameter settings are as follows.

Command value	Command name	Direction	Function	Request parameters	PubAck reply parameters
100	MEDIA_GET_METADATA	C->S	Obtain metadata	None	s0:Reference metadata
101	MEDIA_PLAY	C->S	Play	None	No parameters
102	MEDIA_PAUSE	C->S	Pause	None	No parameters
103	MEDIA_NEXT	C->S	Next Track	None	No parameters
104	MEDIA_PREV	C->S	Previous Track	None	No parameters
105	MEDIA_SEEK	C->S	Skip broadcast	i1: Skip position, in seconds	No parameters
106	MEDIA_GET_POSITION	C->S	Get playback position	None	s0: Current time (seconds): Total time (seconds)
107	MEDIA_SET_VOLUME	C->S	Set Volume	i1: Volume value (0~100)	No parameters
108	MEDIA_GET_VOLUME	C->S	Get Volume	None	i1: Volume value (0~100)
109	MEDIA_GET_ALL_LOCAL_MEDIA	C->S	Retrieve information about all local songs	None	s0:Simple music metadata array
110	MEDIA_PLAY_LOCAL_SONG	C->S	Play local song	s0:Simple music metadata array i1:Start play index	No parameters
111	MEDIA_SWITCH_PLAY_MODE	C->S	Switch play mode, if it is a radio type, it will prompt that the radio type mode cannot be switched	None	No parameters
112	MEDIA_GET_SCENE_MUSICS	C->S	Retrieve all scene music	None	s0: Simple music metadata array, the valid fields of scene music are only songId, songTitle
113	MEDIA_PLAY_SCENE_MUSIC	C->S	Play scene music	i1:Scene music ID, i.e., the songId field in metadata	No parameters
114	MEDIA_PLAY_LOCAL_ONE_SONG	C->S	Play local one song, single track does not loop	s0: Only one simple music metadata, not an array	No parameters
115	MEDIA_GET_PLAY_MODE	C->S	Get current playback mode	None	i1: Playback mode 0: Repeat all 1: Single loop 2: Shuffle play
116	MEDIA_PLAY_TTS	C->S	Play TTS text using voice	s0:TTS text	No parameters
118	MEDIA_PLAY_HINT_PATH	C->S	Sound playback hint	s0:Complete path of the sound hint	No parameters
119	MEDIA_GET_AUDIO_SOURCE	C->S	Get the current audio source	None	s0: The current audio source
120	MEDIA_SET_AUDIO_SOURCE	C->S	Switch audio source	s0:Target audio source	No parameters
150	MEDIA_REPORT_METADATA	S->C	Feedback metadata	s0:Reference metadata	The client does not need to reply
151	MEDIA_REPORT_PlAY_STATE	S->C	Feedback play state	i1: Play state 0:Pause 1:Playing 2:Buffering ended	Client does not need to reply
152	MEDIA_REPORT_VOLUME	S->C	Feedback Volume	i1: Volume value (0~100)	The client does not need to reply
153	MEDIA_REPORT_PLAY_MODE	S->C	Feedback the current playback mode	i1: Playback mode 0: Repeat all 1: Single loop 2: Shuffle play 3: Play in order	No response required from the client
154	MEDIA_REPORT_AUDIO_SOURCE	S->C	Report the current audio source	None	s0: current audio source sdcard: local bt: Bluetooth online: online auxin: external audio
155	MEDIA_REPORT_PROGRESS	S->C	Report current playback progress	No information	s0: Current time (seconds): Total time (seconds)
200	DEVICE_POWER_ON	C->S	Turn on screen	None	No parameters
201	DEVICE_POWER_OFF	C->S	Turn off screen	None	No parameters
202	DEVICE_POWER_REBOOT	C->S	Reboot	None	No parameters
203	DEVICE_GET_POWER_STATUS	C->S	Obtain power-on status	None	i1: 0 means shutdown, 1 means powered on
204	DEVICE_GET_INFO	C->S	Obtain device information	None	s0: Xiao Ke host information uuid, name, version, etc.
205	MEDIA_SET_AUDIO_SYNC	C->S	Set to broadcast or partition mode	None	No parameters
206	MEDIA_SET_AUDIO_SWITCH_CHANNEL	C->S	Set partition	i1:Channel partition (1:Partition 1, 2:Partition 2)	No parameters
207	MEDIA_GET_AUDIO_SYNC	C->S	Obtain current mode	None	i1: Broadcast status (1: synchronized, 0: partitioned)
208	MEDIA_GET_AUDIO_SWITCH_CHANNEL	C->S	Get the current partition	None	i1: Channel partition (1: Partition 1, 2: Partition 2)
209	MEDIA_AUDIO_SYNC	S->C	Listen to the current mode	i1: Broadcast status (1: synchronized, 0: partitioned)	The client does not need to reply
210	MEDIA_AUDIO_SWITCH_CHANNEL	S->C	Listen to the current partition status	i1: Channel partition (1: Partition 1, 2: Partition 2)	The client does not need to reply
211	MEDIA_SET_VOICE_CHANNEL1	C->S	Set the volume of partition 1	i1: Volume value (0~100)	No parameters
212	MEDIA_SET_VOICE_CHANNEL2	C->S	Set the volume for partition 2	i1: Volume value (0~100)	No parameters
213	MEDIA_GET_VOICE_CHANNEL	S->C	Feedback the current partition volume	s0: Volume (":") 0: The * before the colon is the volume of partition 1 1: The volume of partition 2 after the colon 2: Range 0-100	No response required by the client
214	MEDIA_GET_VOICE_CHANNEL1	C->S	Obtain volume of partition 1	No parameters	i1: Volume value (0~100)
215	MEDIA_GET_VOICE_CHANNEL2	C->S	Obtain volume of partition 2	No parameters	i1: Volume value (0~100)
216	MEDIA_CHECK_DUAL	C->S	Check if the machine is a dual audio source	None	i1: Music host type (1 indicates dual audio source, 0 does not)

Metadata

{
  "playState": 1,
  "Singer": "Andy Lau",
  "songId": "548408",
  "Songtile": "Love you for 10,000 years",
  "songUrl": "http://www.xxx.com/1.mp3",
  "volume": 80
}

Simple music metadata

  "songId": "548408",
{
  "Songtile": "Love you for 10,000 years",
}

PUBACK

i0: Consistent with the PUBLISH cmd command value
i1, s0: [optional], if you need a feedback message

The reply parameters are as shown in the table above

PINGREQ

No parameters

PINGRESP

No parameters

DISCONNECT

No parameters

1.7. Integration & Development

1.7.1. Client-side process

Discover the background sound host device through DLNA device discovery
Establish a socket link, TCP is connected to port 8000 of the device's IP address, start the socket to send and receive data, and use a newline character as the packet separator.
To send a CONNECT request, refer to the sending data{"type":1,"i0":1, "i1":240} Wait for the server to feedback that the connection is successful. Refer to the received data'{"i0":1,"i1":0, "s0":"OK", "seq":0, "type":2}`
If the connection is successful, send a PUBLISH/MEDIA_GET_METDATA request to obtain metadata. Refer to sending data'{"type":3, "i0":100, "seq":1}`
Decide whether to read the playback position periodically according to the playback state, if s0. PlayState=1, send a request to obtain the playback position, refer to the sending data'{"type":3,"i0":106,"seq":1}`
The client needs to send data to the server within the KeepAlive time period to maintain a long connection, otherwise the server will actively disconnect when it times out. The client also needs to detect whether the PINGREQ/PINGRESP message or ACK message is received. If the client detects an abnormal communication link, it needs to reconnect with the server.
The receiving thread may listen to messages about metadata, playback status, and volume changes.

1.8. Test & debugging method

Go to the background sound system “Settings> Network Settings”, check the ip address, and connect to the background sound system via telnet.

telnet ip address 8000

According to the "Client-side process" above, test the interaction through commands in the telnet terminal

=> telnet 192.168.1.154 8000
Trying 192.168.1.154. . .
Connected to 192.168.1.154.
Escape character is '^]'.
{"type":1,"i0":1,"i1":240}
{"i0":1,"i1":0,"s0":"OK","seq":0,"type":2}
{"type":3,"i0":101,"seq":1}
{"i0":101,"i1":0,"seq":1,"type":4}
{"i0":150,"i1":0,"s0":"{\"playState\":0,\"singer\":\"Brooke White\",\"songId\":\"1552954\",\"songTitle\":\"Let It Be\",\"songUrl\":\"http://mr3.doubanio.com/87b89194e8858151bf1375eb17c96878/0/fm/song/p1552954_128k.mp3\",\"volume\":40}","seq":0,"type":3}
{"i0":151,"i1":2,"seq":0,"type":3}
{"type":3,"i0":102,"seq":1}
{"i0":151,"i1":0,"seq":0,"type":3}
{"i0":102,"i1":0,"seq":1,"type":4}

Send "Connection request" command

{"type":1,"i0":1,"i1":240}

Background sound system return

{"i0":1,"i1":0,"s0":"OK","seq":0,"type":2}

Send "play" command

{"type":3,"i0":101,"seq":1}

Background sound system return

{"i0":101,"i1":0,"seq":1,"type":4}
{"i0":150,"i1":0,"s0":"{\"playState\":0,\"singer\":\"Brooke White\",\"songId\":\"1552954\",\"songTitle\":\"Let It Be\",\"songUrl\":\"http://mr3.doubanio.com/87b89194e8858151bf1375eb17c96878/0/fm/song/p1552954_128k.mp3\",\"volume\":40}","seq":0,"type":3}
{"i0":151,"i1":2,"seq":0,"type":3}

Send "pause" command

{"type":3,"i0":102,"seq":1}

Background sound system return

{"i0":151,"i1":0,"seq":0,"type":3}
{"i0":102,"i1":0,"seq":1,"type":4}

1.9. Reference

1.9.1. Constant definition

In order to simplify the workload of developers, the constant is defined as follows：

public class JSSSConstant {
    public static final int VERSION = 1;
    //JSSS protocol command, type field
    public static final int CONNECT = 1;
    public static final int CONNACK = 2;
    public static final int PUBLISH = 3;
    public static final int PUBACK = 4;
    public static final int PINGREQ = 12;
    public static final int PINGRESP = 13;
    public static final int DISCONNECT = 14;

    //JSSS protocol media control command
    public static final int MEDIA_GET_METADATA = 100;
    public static final int MEDIA_PLAY = 101;
    public static final int MEDIA_PAUSE = 102;
    public static final int MEDIA_NEXT = 103;
    public static final int MEDIA_PREV = 104;
    public static final int MEDIA_SEEK = 105;
    public static final int MEDIA_GET_POSITION = 106;
    public static final int MEDIA_SET_VOLUME = 107;
    public static final int MEDIA_GET_VOLUME = 108;
    public static final int MEDIA_GET_ALL_LOCAL_MEDIA = 109;
    public static final int MEDIA_PLAY_LOCAL_SONG = 110;
    public static final int MEDIA_SWITCH_PLAY_MODE = 111;
    public static final int MEDIA_GET_SCENE_MUSICS = 112;
    public static final int MEDIA_PLAY_SCENE_MUSIC = 113;
    public static final int MEDIA_PLAY_ONCE_LOCAL_SONG = 114;
    public static final int MEDIA_GET_PLAY_MODE = 115;
    public static final int MEDIA_PLAY_TTS = 116;
    public static final int MEDIA_PLAY_HINT_PATH = 118;
    public static final int MEDIA_GET_AUDIO_SOURCE = 119;
    public static final int MEDIA_SET_AUDIO_SOURCE = 120;

    //JSSS protocol media status feedback command
    public static final int MEDIA_REPORT_METADATA = 150;
    public static final int MEDIA_REPORT_PlAY_STATE = 151;
    public static final int MEDIA_REPORT_VOLUME = 152;
    public static final int MEDIA_REPORT_PLAY_MODE = 153;

    //JSSS protocol device control command
    public static final int DEVICE_POWER_ON = 200;
    public static final int DEVICE_POWER_OFF = 201;
    public static final int DEVICE_POWER_REBOOT = 202;
    public static final int DEVICE_GET_POWER_STATUS = 203;
    //JSSS protocol switches dual audio channels
    public static final int MEDIA_SET_AUDIO_SYNC= 205; //Set to simultaneous broadcast or partition
    public static final int MEDIA_SET_AUDIO_SWITCH_CHANNEL= 206; //Set to channel 1 or channel 2

    //Get current status
    public static final int MEDIA_GET_AUDIO_SYNC= 207; // Get whether the current broadcast is simultaneous or partitioned
    public static final int MEDIA_GET_AUDIO_SWITCH_CHANNEL= 208; // Get the current channel

    //JSSS protocol switch dual audio source channel monitoring result returned
    public static final int MEDIA_AUDIO_SYNC= 209; // 1 simultaneous broadcast, 0 partitions
    public static final int MEDIA_AUDIO_SWITCH_CHANNEL= 210;// channels 1, 2

    //JSSS adjust partition volume
    public static final int MEDIA_SET_VOICE_CHANNEL1=211;//Partition one volume
    public static final int MEDIA_SET_VOICE_CHANNEL2=212;//Partition two volume

    //JSSS host partition volume change back
    public static final int MEDIA_GET_VOICE_CHANNEL=213;// Host partition volume change feedback

    //Get instructions for partition volume
    public static final int MEDIA_GET_VOICE_CHANNEL1=214;// Get the volume of the partition
    public static final int MEDIA_GET_VOICE_CHANNEL2=215;// Get partition two volume

    public static final int MEDIA_CHECK_DUAL=216;//Check if the machine is dual-source
    //JSSS status code
    public static final int FAIL = -1;
    public static final int OK = 0;
    }

1.9.2. Examples of common instructions

Connection command


telnet 10.0.0.26 8000

telnet 192.168.1.176 8000
{"type":1,"i0":109,"i1":240}

Get all local songs

{"type":3,"i0":109,"seq":1}

Play local songs

'Note: Before playing local songs, you must first issue instructions to obtain all local songs. s0: Simple music metadata array, i1: Start playing index`

{"i0":110,"i1":0,"s0":"[{\"songId\":\"40\",\"songTitle\":\"DreamVillage_GuZheng-pre\"},{\"songId\":\"101\",\"songTitle\":\"A. I. N. Y. -[Love you]\"}]","seq":1,"type":3}

Play a single local song, the single does not loop

Note: s0 is a single music metadata json string at this time

{"i0":114,"i1":0,"s0":"{\"songId\":\"40\",\"songTitle\":\"DreamVillage_GuZheng-pre\"}","seq":1,"type":3}

Get the current audio source

Note: There are four types of s0 parameters: sdcard local, bt Bluetooth, online online, and auxin external audio


{"i0":119,"seq":1,"type":3}
{"i0":119,"i1":0,"s0":"sdcard","seq":1,"type":4}

Get scene music

{"i0":112,"seq":1,"type":3}

Play scene music i1 is the ID of the scene music to be played

{"i0":113,"i1":"142884","seq":1,"type":3}

Switch audio source

Note: After switching between local or online audio sources, you must send a playback command to play the song If you want to play a local song, use the combination of the 109 (get a local song) and 110 (play a local song) instructions above to achieve it.

If you want to randomly play online songs, you can use the combination of 120 (cut to online audio source) and 101 (play song) instructions to achieve

C -> S
{"i0":120,"s0":"online","seq":1,"type":3}

{"i0":120,"s0":"bt","seq":1,"type":3}

{"i0":120,"s0":"sdcard","seq":1,"type":3}

{"i0":120,"s0":"auxin","seq":1,"type":3}

S -> C

{"i0":120,"i1":0,"seq":1,"type":4}

If the i1 value is 0, the audio source was successfully switched, and the -1 table failed to switch the audio source. play

{"i0":101,"seq":1,"type":3}

Get current music metadata

C -> S
{"type":3,"i0":100,"seq":1}

S -> C
{"i0":100,"i1":0,"s0":"{\"playState\":1,\"singer\":\"Harry Styles\",\"songId\":\"003luGpS16qZgi\",\"songTitle\":\"Sweet Creature\",\"songUrl\":\"http://dl.stream.qqmusic.qq.com/C400003luGpS16qZgi.m4a?vkey=E3EDE3145DFD5364AA8DE7315B218A9A963C25BA76AD47D7760486319CB9A3980125E46BD1A19BF0FBC94D2099B32DD27B0B104FF236EBE5&amp;guid=5358354936&amp;fromtag=30\",\"volume\":7}","seq":1,"type":4}

Switch playback mode

{"type":3,"i0":111,"seq":4}

1.10. FAQ

E: The switch screen operation is only for devices with screens

Q: Why does the server-side Socket connection actively disconnect?

A: Please check if the PING or PUBLISH command has been sent within the KeepAlive time.

Q: Why is the client unsuccessful in publishing the message?

A: Please check whether the seq field is set to a non-zero value and actively increment it.

Q: Window uses PuTTY for testing
A： ! [Configure connection ip and port] (. /pic/PuTTY_11. png)

Send a connection request {"type":1,"i0":1,"i1":240}

! [Send connection request] (. /pic/PuTTY_22. png)

Q: Get the currently playing song information strategy

A: After the socket is connected, you only need to send the command MEDIA_GET_METDATA once to obtain the currently playing song information. As long as the socket connection continues, you can actively feedback the song information through MEDIA_REPORT_PlAY_STATE in the future.

Q: Which newline character to use

A: Use \n uniformly for newline characters

Q: How to get the ID of Xiaoke host device

A: When the device is found, the notify package contains the device ID

Q: What are the playback modes?

A：
0 List loop REPEAT_ALL

1 Single loop REPEAT_ONE<br>
2 Shuffle shuffle<br>

3 PLAY IN ORDER

Q: What information has changed, and the server will take the initiative to report it?

A: After the song, volume, playback status, and playback mode of Xiaoke host terminal change, the new status will be actively reported.

Q: How to get the playback progress

A: The current playback progress, C should take the initiative to query S, COMMAND: MEDIA_GET_POSITION

Q: The client sends the M-SEARCH package, but the server will not answer immediately.

A: The SSDP packet is a unicast packet, and there is a possibility of packet loss. Each time you send a search package, you can send multiple

Q: If the network is not good, under what circumstances will Xiaoke take the initiative to disconnect, is there a reconnection mechanism?

A: JSSS Xiaoke can be used as the server side and will not decide to disconnect based on network conditions. It will be reconnected, and the client needs to send data to the server within the KeepAlive time period to maintain a long connection, otherwise the server will actively disconnect when it times out. The client also needs to detect whether the PINGREQ/PINGRESP message or ACK message is received. If the client detects an abnormal communication link, it needs to reconnect with the server.

#

Attach the cmd command method to view the test

JSSS protocol test

cmd input telnet + host ip + fixed port 8000 The computer and the host are in the same LAN

Such as telnet 192.168.1.210 8000

{"type":1,"i0":1,"i1":240} Send request connection
{"type":3,"i0":100,"seq":1} Get metadata
{"type":3,"i0":101, "seq":1} Play
{"type":3,"i0":102,"seq":1} Pause
{"type":3,"i0":103,"seq":1} Next song
{"type":3,"i0":104,"seq":1} Previous song
{"type":3,"i0":105,"i1":20,"seq":1} Skip
{"type":3,"i0":106,"seq":1} Get playback progress
{"type":3,"i0":107,"i1":10,"seq":1} Set the volume i1 represents the set value
{"type":3,"i0":108,"seq":1} Check the volume from the host
{"type":3,"i0":109,"seq":1} Get all local song information
{"type":3,"i0":110,"seq":1,"i1":0,"s0":"[{\"songId\":\"40\",\" songTitle\":\"DreamVillage_GuZheng-pre\"}]"} Play local song information
{"type":3,"i0":111,"seq":1} Switch playback mode
{"type":3,"i0":112,"seq":1} Get scene music/without recommended radio playlist
{"type":3,"i0":113,"i1":47999835,"seq":1} Play the specified favorite song list, i1 song list id
{"type":3,"i0":114,"seq":1,"i1":0,"s0":"{\"songId\":\"40\",\" songTitle\":\"DreamVillage_GuZheng-pre\"}"}PlayLocal single song, single does not loop
{"type":3,"i0":115, "seq":1} Get the current mode, the single does not loop 4
{"type":3,"i0":118,"seq":1,"s0":"/storage/emulated/0/Music/DreamVillage_GuZheng-pre.mp3"}Play a tone
{"type":3,"i0":119,"seq":1} Get the current audio source
{"type":3,"i0":120,"s0":"bt","seq":1} Switch audio source
{"type":3,"i0":200,"seq":1} Open screen
{"type":3,"i0":201,"seq":1} Turn off the screen
{"type":3,"i0":202,"seq":1} Restart
{"type":3,"i0":203,"seq":1} Get the boot status
{"type":3,"i0":204,"seq":1} Get device information
{"type":3,"i0":205,"seq":1} Set up simultaneous broadcast or partition
{"type":3,"i0":206,"i1":2,"seq":1} Set the partition
{"type":3,"i0":207,"seq":1} Get the current simultaneous broadcast or partition mode
{"type":3,"i0":211,"i1":30,"seq":1} Set the volume of partition one
{"type":3,"i0":212,"i1":50,"seq":1} Set the volume of partition 2
{"type":3,"i0":214,"i1":30,"seq":1} Get the volume of the partition
{"type":3,"i0":215,"i1":30,"seq":1} Get the volume of partition two

1. JdPlaySS protocol

1.1. Usage scenario

1.2. Overview

1.3. Interactive diagram

1.4. Conditions & Constraints

1.5. Discover protocol

1.6. Control protocol

1.6.1. Message type

1.6.2. Message description

CONNECT

CONNACK

PUBLISH

Metadata

Simple music metadata

PUBACK

PINGREQ

PINGRESP

DISCONNECT

1.7. Integration & Development

1.7.1. Client-side process

1.8. Test & debugging method

1.9. Reference

1.9.1. Constant definition

1.9.2. Examples of common instructions

1.10. FAQ

E: The switch screen operation is only for devices with screens

Q: Why does the server-side Socket connection actively disconnect?

Q: Why is the client unsuccessful in publishing the message?

Q: Window uses PuTTY for testingA： ! [Configure connection ip and port] (. /pic/PuTTY_11. png)

Send a connection request {"type":1,"i0":1,"i1":240}

Q: Get the currently playing song information strategy

Q: Which newline character to use

Q: How to get the ID of Xiaoke host device

Q: What are the playback modes?

Q: What information has changed, and the server will take the initiative to report it?

Q: How to get the playback progress

Q: The client sends the M-SEARCH package, but the server will not answer immediately.

Q: If the network is not good, under what circumstances will Xiaoke take the initiative to disconnect, is there a reconnection mechanism?

#

Attach the cmd command method to view the test

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Q: Window uses PuTTY for testing
A： ! [Configure connection ip and port] (. /pic/PuTTY_11. png)