This guide descries how to establish a WiFi connection with the EV3 LEGO Mindstorms brick using the standard firmware. Before you can establish a connection you need a USB WiFi dongle that is supported by the firmware. Currently only one dongle is supported namely the NetGear WNA1100. Once you got your hands on one follow the description below to make the brick connect to a network.
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Connecting the EV3 to a network
If everything works out right you should now be connected to a WiFi network. Now it is time to establish a connection as shown in the next step.
Establishing a TCP/IP connection with the EV3
Since connecting to the brick is not as strait forward as just opening a TCP/IP connection I have provided a Wireshark dump of a connection sequence. Overall the following steps are needed to unlock the EV3 brick and make it accept a TCP/IP connection.
Listening for UDP broadcast
Approximately every 10 seconds the EV3 will broadcast a UDP message on port 3015. The message is 67 bytes in size and contains the following text:
The serial number is needed when establishing a TCP/IP connection later on so remember it. Also the source port used for the UDP broadcast must also be the port used in the next step where we send a UDP message back to the brick to let it know that we wish to establish a TCP/IP connection.
Sending a UDP message back to the EV3
The contents of the data is irrelevant so just send a single byte. The important thing is that you send it to the source port that was used in the bricks broadcast message ( this is not port 3015). Once a message has been send the brick is ready to accept a TCP/IP connection.
![]() Establish a TCP/IP connection
Connect to the brick using TCP/IP on port 5555 and use this connection to send the unlock message
Sending the unlock message
The unlock message has the following format:
Where 0016533F0C1E is the serial number from the UDP broadcast. The brick should now reply with a 16 byte TCP/IP message with the following text:
indicating that the connection has been established. Now you should be able to send both system and direct commands to the brick over a WiFi connection.
Sending data over WiFi using the MonoBrick communication library
Below some sample code for the MonoBrick communication library is shown. Here a WiFi connection is used to control motor A.
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