CC-Tweaked/doc/events/rednet_message.md

---
module: [kind=event] rednet_message
see: modem_message For raw modem messages sent outside of Rednet.
see: rednet.receive To wait for a Rednet message with an optional timeout and protocol filter.
---

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SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers

SPDX-License-Identifier: LicenseRef-CCPL
-->

The @{rednet_message} event is fired when a message is sent over Rednet.

This event is usually handled by @{rednet.receive}, but it can also be pulled manually.

@{rednet_message} events are sent by @{rednet.run} in the top-level coroutine in response to @{modem_message} events. A @{rednet_message} event is always preceded by a @{modem_message} event. They are generated inside CraftOS rather than being sent by the ComputerCraft machine.

## Return Values
1. @{string}: The event name.
2. @{number}: The ID of the sending computer.
3. @{any}: The message sent.
4. <span class="type">@{string}|@{nil}</span>: The protocol of the message, if provided.

## Example
Prints a message when one is sent:
```lua
while true do
  local event, sender, message, protocol = os.pullEvent("rednet_message")
  if protocol ~= nil then
    print("Received message from " .. sender .. " with protocol " .. protocol .. " and message " .. tostring(message))
  else
    print("Received message from " .. sender .. " with message " .. tostring(message))
  end
end
```