fix(net): bad channel + change return of sendQuery

libs/net.lua

@@ -13,21 +13,20 @@ end
 net.listenQuery = function(hostname, processQueryMessage)
   assertRednetIsOpened()
 
-  rednet.host(QUERY_PROTO, hostname)
-
   local serverRunning = true
 
   local function stopServer()
     serverRunning = false
   end
 
+  rednet.host(QUERY_PROTO, hostname)
+
   while serverRunning do
     local computerId, message = rednet.receive(QUERY_PROTO)
     local responseMessage = processQueryMessage(textutils.unserialize(message), computerId, stopServer)
     rednet.send(computerId, textutils.serialize(responseMessage), QUERY_RESPONSE_PROTO)
   end
 
-  -- in case we decide to exit the loop in the future
   rednet.unhost(QUERY_PROTO)
 end
 
@@ -38,19 +37,19 @@ net.sendQuery = function(hostname, message, timeout)
   local serverId = rednet.lookup(QUERY_PROTO, hostname)
 
   if not serverId then
-    return false, 'hostname lookup error'
+    return nil, 'hostname lookup error'
   end
 
   local sendOk = rednet.send(serverId, textutils.serialize(message))
 
   if not sendOk then
-    return false, 'rednet error'
+    return nil, 'rednet error'
   end
 
   local responseServerId, responseMessage = rednet.receive(QUERY_RESPONSE_PROTO, timeout)
 
   if not responseServerId then
-    return false, 'timeout'
+    return nil, 'timeout'
   end
 
   return textutils.unserialize(responseMessage)