EDIT: what I'm trying to do is essentially configure the station after
the softap is running a TCP server.
I get a panic error for wifi.sta being nil when I call wifi.sta.config(station_cfg) even after I configured it properly before.
When I do:
function connectHib()
wifi.setmode(wifi.STATIONAP)
[AP config here]
station_cfg={}
station_cfg.ssid = ""
station_cfg.pwd = ""
station_cfg.save = false
station_cfg.auto = false
wifi.sta.config(station_cfg)
end
It works fine, but when I call it, then start a server with srv=net.createServer(net.TCP) and then call the following function:
function validateSTA()
station_cfg={}
station_cfg.ssid = _G.wifi
station_cfg.pwd = _G.senha
station_cfg.save = false
station_cfg.auto = false
wifi.sta.config(station_cfg) -- this creates an error
wifi.sta.connect()
end
It gives me a PANIC error on the commented line. I'm just trying to reconfigure the STATION module only and then tell it to connect so I can validate the conection.
I'm using:
NodeMCU custom build by frightanic.com
branch: master
commit: 67027c0d05f7e8d1b97104e05a3715f6ebc8d07f
SSL: false
modules: adc,file,gpio,net,node,pwm,sjson,tmr,uart,wifi
build created on 2018-04-16 13:55
powered by Lua 5.1.4 on SDK 2.2.1(cfd48f3)
What bugs me is why it seems like it has not been "declared" before, but it works on the first function... I thought wifi. was global like _G. variables.
It also works if I call the functions separately on the ESPlorer command line on an ESP without my init.lua.
I also tried the debug firmware and the only odd thing I saw poping up was wifi_event_monitor_handle_event_cb that is called every 4 secconds or so.
Thanks guys, any help is apreciated as I'm stuck about a week now.
Like many other script languages, lua doesn't have declarations, only assignments.
You should perform checks what is wifi's value during the first and the second calls. It seems that at first you are using it as a table, and in the second function you try to use it as a string in the station_cfg.ssid = _G.wifi.
Or the reason is that global variables are not "like _G", they're stored in _G.
Related
I'll make this really simple. I'm making an admin commands system and I'm trying to turn on a TextButton inside of the player (plr.PlayerGui.adminUi) when they chat ":cmdb". I've debbuged with print statements and all works. I added a print statement to tell me the status of "commandbar.Visibility" and it says that it's true, even though you can't see it and the checkbox in properties is false.
This is what I've had so far, with no error messages. This works the first time, but never works again. (this is in a module script)
commands.cmdb = {0, function(plr, rsp)
game.Players[plr.Name].PlayerGui.adminUi.commandbar.Visible = true
end}
This is the explorer:
and this is the code for "Exit":
script.Parent.MouseButton1Up:Connect(function()
script.Parent.Parent.Visible = false
end)
Any help is appreciated, and if I missed anything neccessary, please let me know!
What you need to do is use remote events to connect the player to the server and you have to use a local script to change the visibility. :fireclient(player) is what you need to do from the server side
https://developer.roblox.com/en-us/api-reference/function/RemoteEvent/FireServer
I have setup a PowerDNS (4.0.4-1+deb9u4) upon Debian 9 with a MySQL backend successfully and the system was resolving hosts correctly. I am attempting to add scripting to the recursor and have used the examples, Lua script examples. I have pointed the pdns-resolver's conf correctly at my lua script, and I see my log statements print correctly, but I am consistently receiving an error regarding the DNSQuestion instance being empty for all of the example lua functions.
For example:
function preresolve(dq)
pdnslog("Got question for "..dq.qname:toString().." from "..dq.remoteaddr:toString().." to "..dq.localaddr:toString())
return true;
end
Results in :
STL error (a.root-servers.net/A from 127.0.0.1): Trying to cast a lua variable from "nil" to "b" (meaning the DNSQuestion instance is null).
Clearly the lua script is running, but for some reason, all the dq instances are empty.
Is there anything that I may have misunderstood or am missing that would cause the parameter to be nil?
Have your function return true or false so it will not return nil by default.
On an ESP8266, a LUA tmr.create() fails. Just a single line of code from the nodemcu docs. I've yet to get this working; stumped; have found nothing on the 'net here or forums. Posted in several other places with no replies. Odd
Basic node commands work. And, here's the thing that's getting me: some timer functions work - for instance tmr.alarm() does - but tmr.create() doesn't.
QUESTION 1: if the tmr module is loaded, isn't the entire module loaded, not just parts of it?
When I try this one line copied directly from the NodeMCU docs, it fails:
local mytimer = tmr.create()
with the usual message, I understand to mean an object is undefined:
stdin:1: attempt to call field 'create' (a nil value)
QUESTION 2: What am I missing or doing wrong?
Nodemcu's flasher successfully sent its default
INTERNAL://NODEMCU # 0x00000
NodeMCU 0.9.5 build 20150318
The board is an Adafruit Huzzah ESP8266, not a NodeMCU board. They both use the same ESP12, I think, so that shouldn't matter (or I hope it doesn't :-/)
NodeMCU 0.9.5 build 20150318
There's your culprit. That version is ancient. create() was added much later. Build a recent version from the master branch, https://nodemcu.readthedocs.io/en/master/en/build/ (note master in the URL), and flash that one.
I use VLC media player 1.1.9 on Ubuntu 11.04. I'm trying to experiment with lua extensions for VLC; so I've added the file test.lua in ~/.local/share/vlc/lua/extensions/, which has only these two lines:
fps="25.000"
frame_duration=1/tonumber(fps)
When I run vlc with verbose output for debugging, I get (edited to split on multiple lines:):
$ vlc --verbose 2
...
[0xa213874] lua generic warning: Error loading script
~/.local/share/vlc/lua/extensions/test.lua:
.../.local/share/vlc/lua/extensions/test.lua:2:
attempt to call global 'tonumber' (a nil value)
...
Now, as far as I know, tonumber as function is part of Lua5.1 proper (Lua 5.1 Reference Manual: tonumber) - and on my system:
$ locate --regex 'lua.*so.*' | head -4
/usr/lib/libipelua.so.7.0.10
/usr/lib/liblua5.1.so
/usr/lib/liblua5.1.so.0
/usr/lib/liblua5.1.so.0.0.0
... apparently I do have Lua 5.1 installed.
So, why do I get an error on using tonumber here - and how can I use this (and other) standard functions in a VLC lua extension properly?
Documentation is sparse for VLC Lua extensions to say the least but I did find an example in the github vlc repository here: https://github.com/videolan/vlc/blob/master/share/lua/extensions/VLSub.lua
Judging from that example it appears you need to supply some basic event functions for your addon for VLC to call into when certain events happen. Some of the obvious callback handlers I've noticed:
descriptor, this should return a table that contains fields describing your addon.
activate, this seems to get called when you activate it from view menubar.
deactivate, called when you deactivate the addon from view menubar.
plus a couple of other functions like close and input_change which you can guess what they're for.
From my brief testing done on VLC 2.0.8 under Win7 it appears VLC loads the lua extension using an empty sandbox environment. This is likely the reason you're getting nil for tonumber and I'm betting none of the other standard lua functions are accessible either when you try to perform computation at this global scope.
However, if I move that code into one of the event handling functions then all those standard functions are accessible again. For example:
function descriptor()
return
{
title = "Test Ext";
version = "0.1";
author = "";
shortdesc = "Testing Lua Extension";
capabilities = {};
description = "VLC Hello Test Addon";
}
end
function activate()
print "test activating"
local fps = tonumber "25.000"
local frame_duration = 1 / fps
print(frame_duration)
return true
end
-- ...
That prints out what you would expect in the console debug log. Now the documentation (what little there is) doesn't mention any of this but what's probably happening here is VLC is injecting the standard lua functions and vlc api table into the sandboxed environment when any of these event handlers get called. But during the extension loading phase, it is done in an empty sandbox environment which explains why all those lua function calls end up being nil when you try to use it at the outter most scope.
I recommend cloning the VLC source tree from github and then performing a grep on the C source that's embedding lua to see what VLC is really doing behind the scenes. Most of the relevant code will likely be here: https://github.com/videolan/vlc/tree/master/modules/lua
Probably some extension script installed in your system overwrites the function and the Lua interpreter instance is shared between all extension scripts, so you end up not being able to call the function if that script is called before yours.
As a quick workaround, Lua being dynamically typed, you can still do things like:
1 / "25.000"
and the string will be coerced to a number.
Alternatively, you can define a tonumber equivalent like:
string_to_num = function(s) return s + 0 end
This again relies on dynamic typing.
I'm new to Lua altogether, and this is my first attempt at writing a wireshark dissector.
I want to analyze SSH without cipher by Lua script. I write a script to detect the packet length and padding length for the first step.
Here is my script:
do
local p_test = Proto("test","Test.");
local f_packet_length = ProtoField.uint32("packet_length")
local f_padding_length = ProtoField.uint8("padding_length")
p_test.fields = {
f_packet_length,
f_padding_length
}
function p_test.dissector(buf,pkt,root)
local offset = 0
local buf_len = buf:len()
local t = root:add(p_test, buf:range(offset))
t:add(f_packet_length,buf:range(offset,4))
offset = offset+4
t:add(f_padding_length,buf:range(offset,1))
offset = offset+1
end
local tcp_table = DissectorTable.get("tcp.port")
tcp_table:add(22,p_test)
end
After I run the code through Evalutate Lua and applied the test filter, I find that there is an error in Packet Details:
Lua Error: [string "do..."]:19: Tree item ProtoField/Protocol handle is invalid (ProtoField/Proto not registered?)
Line 19 corresponds the t:add(f_packet_length... line.
Could anyone help to explain this error?
Thanks in advance.
Your code above will work fine if it's in a real Lua script for Wireshark... either by being in a .lua file in the personal plugins directory, or by being loaded with the "-X lua_script:<filename>" command line switch.
But you can't register a new protocol in the tools->evaluate window, because it's too late by then to register a new protocol (or new fields). Unfortunately the error Wireshark reports isn't clear about that, because it sort of half works, but really it's not working and cannot work.
The problem is new protocol registration happens in two phases internally: the first phase is when the Lua scripts are loaded and executed, which adds the protocol and fields to an internal temporary table, and then after all the lua scripts load then the second phase has new protocols and fields moved from the temporary table into their final run-time tables and registered, and then wireshark finishes loading and you see the GUI. That second phase happens once and only once, when Wireshark first starts up. But running the tools->evaluate window happens after all that, so it's too late.