Cannot read canbus port with read_frame() CAN API

ArduPilot Lua Scripting
1

Hi! I’m trying read of canbus port while script Lua. I configured parameters respect of CAN:
- CAN_D1_PROTOCOL = 10 – Scripting
- CAN_P1_DRIVER = 1 – First Driver

I have 2 scripts: Read and Write.

Script write

-- Load CAN driver, using the scripting protocol and with a buffer size of 5

local driver = CAN:get_device(5)

if driver then
  local message = string.format("ID: %d se pudo obtener el dispositivo CAN para escribir",5)
  print(message)
  return 
end

function update()
  local msg = CANFrame()

  msg:id( (uint32_t(1) << 31) | (uint32_t(30) << 24) | (uint32_t(1081) << 8) | uint32_t(11) )

  msg:data(0,0) -- set light_id = 0

  -- sending 4 bytes of data
  msg:dlc(4)

  -- write the frame with a 10000us timeout
  driver:write_frame(msg, 10000)

  return update,100

end
return update

And script read:

-- This script is an example of reading from the CAN bus


-- Load CAN driver1. The first will attach to a protocol of 10
local driver1 = CAN:get_device(5)

function show_frame(dnum, frame)
    local message = string.format("CAN[%u] msg from " .. tostring(frame:id()) .. ": %i, %i, %i, %i, %i, %i, %i, %i", dnum, frame:data(0), frame:data(1), frame:data(2), frame:data(3), frame:data(4), frame:data(5), frame:data(6), frame:data(7))
    print(message)
end

function update()

   -- see if we got any frames
   if driver1 then
      frame = driver1:read_frame()
      show_frame(0,frame)
   end

  return update, 10

end

return update()

And frame variable of script read is nil. Can someone help me? Also, I have tried examples ardupilot/libraries/AP_Scripting/examples/CAN_read.lua at master · ArduPilot/ardupilot · GitHub , But the same thing happens to me.

Thanks!!
CAN_read.lua (637 Bytes)
CAN_write.lua (590 Bytes)