[string "<function>"] unexpected symbol and = expected

Before anything, I'd like to iterate I'm relatively new to Lua, and a complete noob to ComputerCraft; and I'm probably just having a minor problem that can easily be fixed. Nevertheless, I appreciate any attempt to help, successful or unsuccessful.
Here goes:

I'm trying to make a telecommunications network in between several computers (Three, so far), a pocket advanced computer, a main computer which acts like both a server and console, and finally a computer to control my house (Doors, lightning, etc.)

Mainly, my computers are composed of a basic setup for the connections, which includes functions like:

function sethost()  --checks if rednet is started, if not, it errors. If it is, then it sets the computer on a host.
sethost_start = rednet.isOpen()
if sethost_start == true then
rednet.host("alpha", "main")
else error("rednet is not started")
end
hostset = true --Just an utility, I might remove it later on since so far I haven't used it.
end

function peerCheck() --Checks for the availability of the other computers, only the Main Computer has all of them, the others just need to access the Main Computer
homeControlComputer = rednet.lookup("beta", "homeControl") --The hierarchy is set as a level, the protocols go from the first level to upper levels, the first one being the root; I chose to use greek numerals in an ascending manner
storageControlComputer = rednet.lookup("beta", "storageControl") --Storage Control isn't available /yet/
phone = rednet.lookup("gamma", "pocketComputerDG")
end


function startup() --This runs every function, and determines every global variable in the order required. It's called right after being defined.
monitor = peripheral.wrap("bottom")
rednet.open("left")
sethost()
peerCheck()
end

Now, the first piece of code, which is the Main Computer, is the one that actually works (Or so I've been led to believe, without the other two I can't test for continous use)

function sethost()
sethost_start = rednet.isOpen()
if sethost_start == true then
rednet.host("alpha", "main")
else error("rednet is not started")
end
hostset = true
end

function peerCheck()
homeControlComputer = rednet.lookup("beta", "homeControl")
storageControlComputer = rednet.lookup("beta", "storageControl")
phone = rednet.lookup("gamma", "pocketComputerDG")
end

--action functions start

function homeControlComputer_door()
rednet.send(homeControlComputer, openMainGate_toggle)
local senderId, message, protocol = rednet.receive(beta, 20)
local message = doorState
term.blit(message, "blue", "black")
end

function homeControlComputer_lights()
rednet.send(homeControlComputer, turnLights_toggle)
local senderId, message, protocol = rednet.receive(beta, 20)
local message = lightsState
term.blit(message, "blue", "black")
end

--action functions end

function startup()
monitor = peripheral.wrap("bottom")
rednet.open("left")
sethost()
peerCheck()
end

startup()

while true do

senderId, message, protocol = rednet.receive()

if senderId == phone and protocol == gamma then
if message == "request_doorState" then
rednet.send(phone, doorState)
elseif message == "request_lightsState" then
rednet.send(phone, lightsState)

elseif message == "door" then
homeControlComputer_lights()

elseif message == "light" then
homeControlComputer_door()
end
end
end

Next, we've got the Pocket Computer (defined as "phone" in Main Computer); this gives me the following error: bios:14: [string "startup"]:69: '=' expected

--phone

function sethost()
sethost_start = rednet.isOpen()
if sethost_start == true then
rednet.host("gamma", "pocketComputerDG")
else error("rednet is not started")
end
hostset = true
end

function peerCheck()
mainComputer = rednet.lookup("alpha", "main")
end

function checkstates()
rednet.send(mainComputer, "request_doorStatus")
local senderId, message, protocol = rednet.receive(alpha, 20)
if message == true or false then
doorState = message
rednet.send(mainComputer, "request_lightsStatus")
local senderId, message, protocol = rednet.receive(alpha, 20)
if message == true or false then
lightsState = message
end
end
end

function startup()
pocketComputerDG_nativeMonitor = term.native()
mainBgcolor = colors.lightBlue
mainTextColor = colors.white
secondBgColor = colors.blue
secondTextColor = colors.lightGray
cords = {
mainWindowAlphaX = 8, mainWindowAlphaY = 0, mainWindowBetaX = 8, mainWindowBetaY = 20,
houseControlAlphaX = 19, houseControlAlphaY = 7, houseControlBetaX = 8, houseControlBetaY = 5,
doorOpenAlphaX = 19, doorOpenAlphaY = 7, doorOpenBetaX = 8, doorOpenBetaY = 5,
lightsOnAlphaX = 0, lightsOnAlphaY = 7, lightsOnBetaX = 8, lightsOnBetaY = 5
}
rednet.open("front")
sethost()
peerCheck()
pocketComputerDG_mainMenu()
checkstates()
end

--action functions start

function pocketComputerDG_mainMenu()

houseControlMenuActive = false

--Main Window
pocketComputerDG_nativeMonitor_windowInfo = window.create(pocketComputerDG_nativeMonitor, 8, 0, 8, 20, true)
term.redirect(pocketComputerDG_nativeMonitor_windowInfo)
term.blit("DiegoG's Touchpad, please select a function", mainTextColor, mainBgcolor)

--House Control
pocketComputerDG_nativeMonitor_windowHouseControl = window.create(pocketComputerDG_nativeMonitor, 19, 7, 8, 5, true)
term.redirect(pocketComputerDG_nativeMonitor_windowHouseControl)
term.blit("House Control", secondTextColor, secondBgColor)

end

function pocketComputerDG_houseControlMenu()
term.clear

houseControlMenuActive = true

pocketComputerDG_nativeMonitor_windowHouseControl_DoorOpen = window.create(pocketComputerDG_nativeMonitor, 19, 7, 8, 5, true)
term.redirect(pocketComputerDG_nativeMonitor_windowHouseControl_DoorOpen)
term.blit("Doors /n"..tostring(doorState), secondTextColor, secondBgColor)

pocketComputerDG_nativeMonitor_windowHouseControl_LightsOn = window.create(pocketComputerDG_nativeMonitor, 0, 7, 8, 5, true)
term.redirect(pocketComputerDG_nativeMonitor_windowHouseControl_LightsOn)
term.blit("Lights /n"..tostring(lightsState), secondTextColor, secondBgColor)

end

function messageMainComputer(msg)
rednet.send(mainComputer, msg)
local senderId, message, protocol = rednet.receive(alpha, 20)
end

--action functions end

startup()

while true do
mouseButton, mouseX, mouseY = os.pullEvent(mouse_click)

if mouseButton == 1 then

if mouseX >= cords.houseControlAlphaX and mouseX <= cords.houseControlBetaX then
if mouseY >= cords.houseControlAlphaY and mouseY <= cords.houseControlBetaY then
pocketComputerDG_houseControlMenu()
end
end

elseif houseControlMenuActive = true then
if mouseX >= cords.doorOpenAlphaX and mouseX <= cords.doorOpenBetaX then
if mouseY >= cords.doorOpenAlphaY and mouseX <= cords.doorOpenBetaY then
messageMainComputer("door")
end
elseif mouseX >= cords.lightsOnAlphaX and mouseX <= cords.lightsOnBetaX then
if mouseY >= cords.lightsOnAlphaY and mouseY <= cords.lightsOnBetaY then
messageMainComputer("light")
end
end

end
end

And finally, the house control computer which errors me with: bios:14 [string "startup"]:20: unexpected symbol

--houseControl

function sethost()
sethost_start = rednet.isOpen()
if sethost_start == true then
rednet.host("beta", "homeControl")
else error("rednet is not started")
end
hostset = true
end

function peerCheck()
mainComputer = rednet.lookup("alpha", "main")
end

--action functions start

function openMainGate()
local isDoorOpen = false
if isDoorOpen == false then redstone.setOutput("right", true) and isDoorOpen == true
elseif isDoorOpen = true then redstone.seOutput("right", false) and isDoorOpen == false
else error("isDoorOpen is neither true nor false") end

if isDoorOpen == true then
local doorState = "Door successfully opened."
elseif isDoorOpen == false then
local doorState = "Door successfully closed."
else error("doorState is neither true nor false") end

rednet.send("mainComputer", doorState)
end

function turnLights()
local areLightsOn = false
if areLightsOn == false then redstone.setOutput("left", true) and areLightsOn = true
elseif areLightsOn == true then redstone.setOutput("left", false) and areLightsOn = false
else error("areLightsOn is neither true nor false") end

if areLightsOn == true then
local lightState = "Lightning successfully turned on."
elseif areLightsOn == false then
local lightState = "Lightning successfully turned off."
else error("doorState is neither true nor false") end

rednet.send("mainComputer", lightState)
end

--action functions end

function startup()
rednet.open("front")
sethost()
peerCheck()
end

startup()

while true do

senderId, message, protocol = rednet.receive(alpha)

if
senderId = mainComputer and protocol = alpha
then
if message = openMainGate_toggle
then openMainGate()
elseif message = turnLights_toggle
then turnLights()
end
end
end

I feel frustrated over the fact that I can't seem to track down the error… even if it looks so simple. I checked the code throughoutly and it doesn't seem like I made any mistake; which is why I post this even if "=" expected is defined in the common errors list.

Thanks again in advance.

In the pocket computer code, you meant to call term.clear(), but you forgot the parentheses (around line 68).

In the house control computer code, your if statement is malformed (around line 20)…

if isDoorOpen == false then redstone.setOutput("right", true) and isDoorOpen == true

It should read…

if isDoorOpen == false then redstone.setOutput("right", true) isDoorOpen = true
elseif isDoorOpen == true then redstone.setOutput("right", false) isDoorOpen = false
else error("isDoorOpen is neither true nor false") end

formatted a little differently, it would look like this…

if isDoorOpen == false then
  redstone.setOutput("right", true)
  isDoorOpen = true
elseif isDoorOpen == true then
  redstone.setOutput("right", false)
  isDoorOpen = false
else
  error("isDoorOpen is neither true nor false")
end

You'll need to fix any other if statements as well.

EDIT: Just noticed that your rednet.send() statements are using a string instead of a number for the computer you are trying to send to - you need to remove the quotes so you're using the variable you set instead of a string.