rednet.isOpen

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Grid Redstone.png  Function rednet.isOpen
Checks to see if the side's modem has been readied for rednet usage. If no side is specified then it returns whether any side has an open modem, though the parameter is not optional under versions of ComputerCraft prior to 1.6.
Syntax rednet.isOpen([string side])
Returns boolean isOpen, if the side has rednet opened it returns true, else false.
Part of ComputerCraft
API rednet

Examples

Grid paper.png  Example
Checks if any side is opened, if so then tell the user.
Code
for n,m in ipairs(rs.getSides()) do 
   if rednet.isOpen(m) then 
     print(m.." is open!") 
   else 
     print(m.." isn't open!") 
   end 
 end


Grid disk.png Rednet API Functions
rednet.open - rednet.close - rednet.send - rednet.broadcast - rednet.receive - rednet.isOpen - rednet.host - rednet.unhost - rednet.lookup