mirror of
https://github.com/pybricks/pybricks-api.git
synced 2026-09-12 01:24:17 +00:00
David Lechner
b1382f02b0
- add separate maibox classes - drop bluetooth module since it is not considered public API
80 lines
2.1 KiB
ReStructuredText
80 lines
2.1 KiB
ReStructuredText
EV3 Mailboxes
|
|
=============
|
|
|
|
TODO: introduction... messages are sent immediately, received messages are held
|
|
in mailbox for getting later.
|
|
|
|
.. rubric:: Pairing
|
|
|
|
Before two EV3s can communicate with each other via Bluetooth, they must be
|
|
paired.
|
|
|
|
TODO: screenshots of pairing with brickman, don't press the connect button!
|
|
|
|
|
|
.. rubric:: Client and server
|
|
|
|
Programs can be written using either an EV3 mailbox *client* object or an EV3
|
|
mailbox *server* object.
|
|
|
|
The only difference between the *client* and the *server* is which one
|
|
initiates the connection at the beginning of the program. After that, sending
|
|
and receiving messages is bidirectional and works the same from either point of
|
|
view.
|
|
|
|
The *server* waits for an incoming connection while the *client* initiates the
|
|
connection. Therefore, the server program must always be started first. If not,
|
|
both programs will wait forever for a connection.
|
|
|
|
|
|
Here is a basic example where two EV3s are connected and send greetings to
|
|
each other.
|
|
|
|
.. rubric:: Client program
|
|
|
|
.. literalinclude::
|
|
../../pybricks-projects/snippets/ev3/bluetooth_client/client.py
|
|
|
|
.. rubric:: Server program
|
|
|
|
.. literalinclude::
|
|
../../pybricks-projects/snippets/ev3/bluetooth_server/server.py
|
|
|
|
|
|
.. rubric:: EV3-G compatibility
|
|
|
|
TODO: screenshots of EV3-G programs, difference between client and server
|
|
program is that client program has connect block. Server is always running.
|
|
|
|
TODO: show equivalent blocks
|
|
|
|
- :class:`pybricks.ev3messaging.LogicMailbox`
|
|
- :class:`pybricks.ev3messaging.NumericMailbox`
|
|
- :class:`pybricks.ev3messaging.TextMailbox`
|
|
|
|
|
|
.. rubric:: More than two bricks
|
|
|
|
A single client EV3 can connect to multiple server EV3s or a single server EV3
|
|
can accept connections from multiple clients.
|
|
|
|
TODO: the actual implementation needs to be updated to match this example.
|
|
|
|
Example::
|
|
|
|
client = EV3MailboxClient()
|
|
|
|
# connect to 4 different servers
|
|
client.connect(SERVER1)
|
|
client.connect(SERVER2)
|
|
client.connect(SERVER3)
|
|
client.connect(SERVER4)
|
|
|
|
|
|
Example::
|
|
|
|
server = EV3MailboxServer()
|
|
|
|
# wait for 4 clients to connect
|
|
server.wait_for_connection(4)
|