Mathematica - IP Connection¶

Enumerate¶

Download (ExampleEnumerate.nb)

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Needs["NETLink`"]
LoadNETAssembly["Tinkerforge",NotebookDirectory[]<>".."]

host="localhost"
port=4223

(* Create IPConnection *)
ipcon=NETNew["Tinkerforge.IPConnection"]
ipcon@Connect[host,port]

(* Print incoming enumeration information *)
EnumerateCB[sender_,uid_,connectedUid_,position_,hardwareVersion_,firmwareVersion_,
            deviceIdentifier_,enumerationType_]:=
 Module[{},
  Print["UID:               "<>uid];
  Print["Enumeration Type:  "<>ToString[enumerationType]];
  If[enumerationType!=Tinkerforge`IPConnection`ENUMERATIONUTYPEUDISCONNECTED,
   Print["Connected UID:     "<>connectedUid];
   Print["Position:          "<>FromCharacterCode[position]];
   Print["Hardware Version:  "<>StringJoin[Riffle[Map[ToString,hardwareVersion],{".","."}]]];
   Print["Firmware Version:  "<>StringJoin[Riffle[Map[ToString,firmwareVersion],{".","."}]]];
   Print["Device Identifier: "<>ToString[deviceIdentifier]]
  ];
  Print[""]
 ]

AddEventHandler[ipcon@EnumerateCallback,EnumerateCB]

(* Trigger enumerate *)
ipcon@Enumerate[]

Input["Click OK to exit"]

(* Clean up *)
ipcon@Disconnect[]
ReleaseNETObject[ipcon]

Authenticate¶

Download (ExampleAuthenticate.nb)

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Needs["NETLink`"]
LoadNETAssembly["Tinkerforge",NotebookDirectory[]<>".."]

host="localhost"
port=4223
secret="My Authentication Secret!"

(* Create IPConnection *)
ipcon=NETNew["Tinkerforge.IPConnection"]

(* Disable auto reconnect mechanism, in case we have the wrong secret. If the authentication is successful, reenable it.*)
ipcon@SetAutoReconnect[False]

(* Authenticate each time the connection got (re-)established *)
ConnectedCB[sender_,connectReason_]:=
 Module[{},
  If[connectReason==Tinkerforge`IPConnection`CONNECTUREASONUREQUEST,Print["Connected by request"]];
  If[connectReason==Tinkerforge`IPConnection`CONNECTUREASONUAUTOURECONNECT,Print["Auto-Reconnect"]];
  (* Authenticate first... *)
  sender@Authenticate[secret];

  (* ...reenable auto reconnect mechanism, as described above... *)
  sender@SetAutoReconnect[False];

  (* ...then trigger enumerate *)
  sender@Enumerate[]
 ]

AddEventHandler[ipcon@Connected,ConnectedCB]

(* Print incoming enumeration information *)
EnumerateCB[sender_,uid_,connectedUid_,position_,hardwareVersion_,firmwareVersion_,
            deviceIdentifier_,enumerationType_]:=
 Print["UID: "<>uid<>", Enumeration Type: "<>ToString[enumerationType]]

AddEventHandler[ipcon@EnumerateCallback,EnumerateCB]

(* Connect to brickd *)
ipcon@Connect[host,port]

Input["Click OK to exit"]

(* Clean up *)
ipcon@Disconnect[]
ReleaseNETObject[ipcon]

Basic Functions¶

IPConnection[] → ipcon¶

Returns:	ipcon -- NETObject[IPConnection]

Creates an IP Connection object that can be used to enumerate the available devices. It is also required for the constructor of Bricks and Bricklets.

ipcon=NETNew["Tinkerforge.IPConnection"]

The .NET runtime has built-in garbage collection that frees objects that are no longer in use by a program. But because Mathematica can not automatically tell when a Mathematica "program" doesn't use a .NET object anymore, this has to be done by the program. For this the ReleaseNETObject[] function is used in the examples.

For further information about object management in .NET/Link see the corresponding Mathematica .NET/Link documentation.

IPConnection@Connect[host, port] → Null¶

Parameters:	host -- String port -- Integer

Creates a TCP/IP connection to the given host and port. The host and port can refer to a Brick Daemon or to a WIFI/Ethernet Extension.

Devices can only be controlled when the connection was established successfully.

Blocks until the connection is established and throws an exception if there is no Brick Daemon or WIFI/Ethernet Extension listening at the given host and port.

IPConnection@Disconnect[] → Null¶

Disconnects the TCP/IP connection from the Brick Daemon or the WIFI/Ethernet Extension.

IPConnection@Authenticate[secret] → Null¶

Parameters:	secret -- String

Performs an authentication handshake with the connected Brick Daemon or WIFI/Ethernet Extension. If the handshake succeeds the connection switches from non-authenticated to authenticated state and communication can continue as normal. If the handshake fails then the connection gets closed. Authentication can fail if the wrong secret was used or if authentication is not enabled at all on the Brick Daemon or the WIFI/Ethernet Extension.

See the authentication tutorial for more information.

New in version 2.1.0.

IPConnection@GetConnectionState[] → connectionState¶

Returns:	connectionState -- Integer

Can return the following states:

• IPConnection`CONNECTIONUSTATEUDISCONNECTED = 0: No connection is established.
• IPConnection`CONNECTIONUSTATEUCONNECTED = 1: A connection to the Brick Daemon or the WIFI/Ethernet Extension is established.
• IPConnection`CONNECTIONUSTATEUPENDING = 2: IP Connection is currently trying to connect.

IPConnection@SetAutoReconnect[autoReconnect] → Null¶

Parameters:	autoReconnect -- True/False

Enables or disables auto-reconnect. If auto-reconnect is enabled, the IP Connection will try to reconnect to the previously given host and port, if the currently existing connection is lost. Therefore, auto-reconnect only does something after a successful Connect[] call.

Default value is True.

IPConnection@GetAutoReconnect[] → autoReconnect¶

Returns:	autoReconnect -- True/False

Returns True if auto-reconnect is enabled, False otherwise.

IPConnection@SetTimeout[timeout] → Null¶

Parameters:	timeout -- Integer

Sets the timeout in milliseconds for getters and for setters for which the response expected flag is activated.

Default timeout is 2500.

IPConnection@GetTimeout[] → timeout¶

Parameters:	timeout -- Integer

Returns the timeout as set by SetTimeout[].

IPConnection@Enumerate[] → Null¶

Broadcasts an enumerate request. All devices will respond with an enumerate callback.

IPConnection@Wait[] → Null¶

Stops the current thread until Unwait[] is called.

This is useful if you rely solely on callbacks for events, if you want to wait for a specific callback or if the IP Connection was created in a thread.

Wait and Unwait act in the same way as Acquire and Release of a semaphore.

IPConnection@Unwait[] → Null¶

Unwaits the thread previously stopped by Wait[]

Wait and Unwait act in the same way as Acquire and Release of a semaphore.

Callbacks¶

Callbacks can be registered to be notified about events. The registration is done by appending your callback handler to the corresponding event:

MyCallback[sender_,value_]:=Print["Value: "<>ToString[value]]

AddEventHandler[ipcon@ExampleCallback,MyCallback]

For further information about event handling using .NET/Link see the corresponding Mathematica .NET/Link documentation.

The available events are described below.

event IPConnection@EnumerateCallback[sender, uid, connectedUid, position, {hardwareVersion1, hardwareVersion2, hardwareVersion3}, {firmwareVersion1, firmwareVersion2, firmwareVersion3}, deviceIdentifier, enumerationType]¶

Parameters:	sender -- NETObject[IPConnection] uid -- String connectedUid -- String position -- Integer hardwareVersioni -- Integer firmwareVersioni -- Integer deviceIdentifier -- Integer enumerationType -- Integer

The event receives seven parameters:

• uid: The UID of the device.
• connectedUid: UID where the device is connected to. For a Bricklet this is the UID of the Brick or Bricklet it is connected to. For a Brick it is the UID of the bottommost Brick in the stack. For the bottommost Brick in a stack it is "0". With this information it is possible to reconstruct the complete network topology.
• position: For Bricks: '0' - '8' (position in stack). For Bricklets: 'a' - 'h' (position on Brick) or 'i' (position of the Raspberry Pi (Zero) HAT) or 'z' (Bricklet on Isolator Bricklet).
• hardwareVersioni: Major, minor and release number for hardware version.
• firmwareVersioni: Major, minor and release number for firmware version.
• deviceIdentifier: A number that represents the device.
• enumerationType: Type of enumeration.

Possible enumeration types are:

• IPConnection`ENUMERATIONUTYPEUAVAILABLE = 0: Device is available (enumeration triggered by user: Enumerate[]). This enumeration type can occur multiple times for the same device.
• IPConnection`ENUMERATIONUTYPEUCONNECTED = 1: Device is newly connected (automatically send by Brick after establishing a communication connection). This indicates that the device has potentially lost its previous configuration and needs to be reconfigured.
• IPConnection`ENUMERATIONUTYPEUDISCONNECTED = 2: Device is disconnected (only possible for USB connection). In this case only uid and enumerationType are valid.

It should be possible to implement plug-and-play functionality with this (as is done in Brick Viewer).

The device identifier numbers can be found here. There are also constants for these numbers named following this pattern:

<device-class>`DEVICEUIDENTIFIER

For example: BrickMaster`DEVICEUIDENTIFIER or BrickletAmbientLight`DEVICEUIDENTIFIER.

event IPConnection@ConnectedCallback[sender, connectReason]¶

Parameters:	sender -- NETObject[IPConnection] connectReason -- Integer

This event is triggered whenever the IP Connection got connected to a Brick Daemon or to a WIFI/Ethernet Extension, possible reasons are:

• IPConnection`CONNECTUREASONUREQUEST = 0: Connection established after request from user.
• IPConnection`CONNECTUREASONUAUTOURECONNECT = 1: Connection after auto-reconnect.

event IPConnection@DisconnectedCallback[sender, disconnectReason]¶

Parameters:	sender -- NETObject[IPConnection] disconnectReason -- Integer

This event is triggered whenever the IP Connection got disconnected from a Brick Daemon or to a WIFI/Ethernet Extension, possible reasons are:

• IPConnection`DISCONNECTUREASONUREQUEST = 0: Disconnect was requested by user.
• IPConnection`DISCONNECTUREASONUERROR = 1: Disconnect because of an unresolvable error.
• IPConnection`DISCONNECTUREASONUSHUTDOWN = 2: Disconnect initiated by Brick Daemon or WIFI/Ethernet Extension.