Robot Fleet (Server)

rednet.open("top")
rednet.broadcast("reset ID")
highID = 0
c = 0
while c != nil do
c = 0
I,m,d = rednet.receive(5)
c = m
if c > highID then
highID = c
end
end
while true do
r = io.read()
if r = "add turtle" then
I,m = rednet.receive()
if m = "getturtleID" then
highID = highID + 1
rednet.send(I, highID)
end
end
if r = "report in" then
rednet.broadcast("report in")
for ts = 0,highID do
I,m = rednet.receive()
print(m)
end
end
else if r != "add turtle" and r != "report in" then
rednet.broadcast(r)
end
end