11 replies to this topic

[EmTeaKay]

How do I read a message and send it to another computer via rednet?

[MysticT]

To receive a message:

local id, msg = rednet.receive()

to send:

rednet.send(theID, "The Message")

The id must be a number, and the message a string.

[EmTeaKay]

Thanks, but I mean if I want to type the message out of lua. That, to my knowledge, can only be used in lua.

[Zalerinian]

EmTeaKay, on 20 June 2012 - 11:15 PM, said:

Thanks, but I mean if I want to type the message out of lua. That, to my knowledge, can only be used in lua.

Please explain this better.

[MysticT]

You have to make a program to do it, there isn't a default program to send/receive messages.
Try with this one:

local tArgs = { ... }
local id = tonumber(tArgs[1])
local msg = tArgs[2]

if not id or not msg then
  print("Usage: send <id> <message>")
  return
end

for _,s in ipairs(rs.getSides()) do
  rednet.open(s)
end

rednet.send(id, msg)

And to receive:

for _,s in ipairs(rs.getSides()) do
  rednet.open(s)
end

local id, msg = rednet.receive()
print(id, ": ", msg)

[EmTeaKay]

Wow! Thanks for that, helped a lot. But this is too complicated for me. But thanks for the help.

while true do
rednet.open("right")
io.read = msg
rednet.broadcast(msg)
end

Will a variation of that work?

[MysticT]

Almost, should be:

rednet.open("right")
while true do
  local msg = read()
  rednet.broadcast(msg)
end

[EmTeaKay]

Perfect! This works amazingly.

Now, how do I send a command through a rednet message? I.e. a reboot message.

[MysticT]

If you want the receiver to execute a command, it has to be waiting for a message, and then execute the command. There's different ways to do it, you can use keywords (like "reboot" to make the computer reboot), or make the computer execute any message it receives as a program (with shell.run).

[EmTeaKay]

Would I do this?

if msg == reboot then
os.reboot()
end

[tfoote]

yes.

[MysticT]

EmTeaKay, on 20 June 2012 - 11:37 PM, said:

Would I do this?

if msg == reboot then
os.reboot()
end

Yes, but remember to put quotes to the strings:

if msg == "reboot" then
  os.reboot()
end