77ed2ccfb1
* update pxt.json files * Fix button event enums fixes https://github.com/microsoft/pxt-calliope/issues/206 * Fix Safari CSS Rule for iOS app fixes https://github.com/microsoft/pxt-calliope/issues/205 * aprove preffered repos should fix https://github.com/microsoft/pxt-calliope/issues/167
68 lines
2.0 KiB
Markdown
68 lines
2.0 KiB
Markdown
# Mini Chat
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## Introduction @unplugged
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Use the **radio** to send and receive messages with other @boardname@.
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## Sending a message @fullscreen
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Use ``||input:on button pressed||`` to send a text message over radio with ``||radio:send string||``.
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Every @boardname@ nearby will receive this message.
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```blocks
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input.onButtonEvent(Button.A, input.buttonEventValue(ButtonEvent.Down), () => {
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radio.sendString("Yo");
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});
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```
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## Receiving a message @fullscreen
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Add a ``||radio:on received string||`` block to run when a message is received.
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```blocks
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radio.onReceivedString(function (receivedString) {
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})
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```
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## Displaying text @fullscreen
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Add a ``||basic:show string||`` to display the string on the screen. Pull the ``||variables:receivedString||`` out of ``||radio:on received string||`` and put it into ``||basic:show string||``.
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```blocks
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radio.onReceivedString(function (receivedString) {
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basic.showString(receivedString);
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})
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```
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## Testing in the simulator @fullscreen
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Press button **A** on the simulator, you will notice that a second @boardname@ appears (if your screen is too small, the simulator might decide not to show it). Try pressing **A** again and notice that the "Yo" message gets displayed on the other @boardname@.
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```blocks
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input.onButtonEvent(Button.A, input.buttonEventValue(ButtonEvent.Down), () => {
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radio.sendString("Yo");
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});
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radio.onReceivedString(function (receivedString) {
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basic.showString(receivedString);
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})
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```
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## Try it for real @fullscreen
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If you two @boardname@s, download the program to each one. Press button **A** on one and see if the other gets a message.
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## Groups @fullscreen
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Use the ``||radio:set group||`` block to assign a **group** number to your program. You will only receive messages from @boardname@s within the same group. Use this to avoid receiving messages from every @boardname@ that is transmitting.
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```blocks
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radio.setGroup(123)
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```
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```package
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radio
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```
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