There is a program that connects to the server and receives some data from it + counts server time and signals every 15 or 60 seconds.
require 'faye/websocket'
require 'eventmachine'
data = []
count = 0
EM.run {
ws = Faye::WebSocket::Client.new('wss://olymptrade.com/ws2')
ws.on :open do |event|
p [:open]
ws.send('{"uuid":"JCBQ7XBRMYSL0JB4N5","pair":"Bitcoin","size":60}')
end
ws.on :message do |event|
p [:message, event.data]
data << event.data
data_servertime = data[0].gsub(/[^\d]/, '').to_i
data.delete_at(0)
if ((data_servertime % 15) == 0)
puts "Прошло 15 секунд"
elsif ((data_servertime % 60) == 0)
puts "Прошло 60 секунд"
end
end
ws.on :close do |event|
p [:close, event.code, event.reason]
ws = nil
end
}
At startup, it constantly outputs the received data to the console:
[:message, "{\"pair\":\"Bitcoin\",\"time\":1516567298,\"open\":11146.938,\"low\":11146.938,\"high\":11146.938,\"close\":11146.938}"]
[:message, "{\"servertime\":1516567298}"]
My Questions:
How do I put the rest of the data in the array (except for servertime) namely: pair,time,open,low,high,close?
How to make it so that ONLY the information displayed on the screen is displayed, which I intentionally output using the puts command?
Related
I am trying to ping a number of IP address on a local network at defined intervals and then send a message only when a device connects. I have managed to get it to work for a single device, but when I add additional devices to the table the code fails.
Many thanks in advance.
An earlier version without the table and just a single IP address works perfectly. But adding the table and the "for key,value loop" only works if a single entry is in the table.
local tble = {
["device name"] = "192.168.1.204"
}
for key,value in pairs(tble) do
statuscheckIP=os.execute("arping -f -w 3 " .. value)
if statuscheckIP ~= lastcheckIP then
if statuscheckIP == 0 and lastcheckIP == 256 then
subject ="" ..key.. " , ( IP Address " ..value.. ") Connected"
message = "Connection Alert\nThe device named " ..key.. ", with the IP address " ..value.. " has just connected to the WiFi network"
--send email notification
luup.call_action("urn:upnp-org:serviceId:SmtpNotification1", "SendEmail", { Recipient_Name="SomeOne", Recipient_eMail="someone#somewhere.com", Subject= subject, Message=message }, 24)luup.call_action("urn:upnporg:serviceId:SmtpNotification1","ResetCount",{}, 24)
else
end
end
end
lastcheckIP = statuscheckIP
The code you posted is valid. There are not many reasons why this would fail due to more entries in your table.
os.execute Execute an operating system shell command. This is like the C system() function. The system dependent status code is returned.
Running os.execute will start a arping and return an exitcode. Then you are comparing that statuscheckIP == 0 a lastcheckIP == 256. The if before is redundant. If true you are sending your message and continuing.
After worked though all entries you are setting lastcheckIP to statusCheckIP and this is propably your error. It should be before the last if and inside your loop. But even then does not make sense if 0 is the only correct return code. If lastcheckIP is set to any other value your both if's will never go true again.
Either your last line lastcheckIP = statuscheckIP is wrongly placed, lastcheckIP was never initialized to 256 or you should rethink your whole program.
EDIT:
After understanding the intention of the provided program, I've created a probably working example. This should show you, how to easily use tables in Lua as a structures. I was not able to test the following code.
local WAIT_TIME = 10
local STATUS_CODE_CONNECTED = 0
local STATUS_CODE_NOT_CONNECT = 256 -- not sure about this (return code from arping for failure)
local device_table =
{
["device_name1"] =
{
ip = "<ip address>",
status_code = STATUS_CODE_NOT_CONNECT
},
["device_name1"] =
{
ip = "<ip address>",
status_code = STATUS_CODE_NOT_CONNECT
}
-- , ...
}
while true do
-- check for changed return codes
for device_name, device in pairs(device_table) do
local temp_status_code = os.execute("arping -f -w 3 " .. device.ip)
-- status code changed
if temp_status_code ~= device.status_code then
-- device connected
if temp_status_code == STATUS_CODE_CONNECTED then
local subject = "" .. device_name .. " , ( IP Address " .. device.ip .. ") Connected"
local message = "Connection Alert\nThe device named " .. device_name .. ", with the IP address " .. device.ip .. " has just connected to the WiFi network"
--send email notification
luup.call_action(
"urn:upnp-org:serviceId:SmtpNotification1",
"SendEmail",
{
Recipient_Name = "SomeOne",
Recipient_eMail = "someone#somewhere.com",
Subject = subject,
Message = message
}, 24)
luup.call_action(
"urn:upnporg:serviceId:SmtpNotification1",
"ResetCount",
{ }, 24)
end
-- update last device status_code if changed
device.status_code = temp_status_code
end
end
os.execute("sleep " .. tonumber(WAIT_TIME)) -- wait some time for next check
end
If I've understand you wrongly and you either do not want to have this program run all the time or do not want to have all addresses in a table then you should ask again or somewhere else because that would be out off topic.
i have a DAG (DAG1) where i copy a bunch of files. I would then like to kick off another DAG (DAG2) for each file that was copied. As the number of files copied will vary per DAG1 run, i would like to essentially loop over the files and call DAG2 with the appropriate parameters.
eg:
with DAG( 'DAG1',
description="copy files over",
schedule_interval="* * * * *",
max_active_runs=1
) as dag:
t_rsync = RsyncOperator( task_id='rsync_data',
source='/source/',
target='/destination/' )
t_trigger_preprocessing = TriggerDagRunOperator( task_id='trigger_preprocessing',
trigger_daq_id='DAG2',
python_callable=trigger
)
t_rsync >> t_trigger_preprocessing
i was hoping to use the python_callable trigger to pull the relevant xcom data from t_rsync and then trigger DAG2; but its not clear to me how to do this.
i would prefer to put the logic of calling DAG2 here to simplify the contents of DAG2 (and also provide stacking schematics with the max_active_runs)
ended up writing my own operator:
class TriggerMultipleDagRunOperator(TriggerDagRunOperator):
def execute(self, context):
count = 0
for dro in self.python_callable(context):
if dro:
with create_session() as session:
dbag = DagBag(settings.DAGS_FOLDER)
trigger_dag = dbag.get_dag(self.trigger_dag_id)
dr = trigger_dag.create_dagrun(
run_id=dro.run_id,
state=State.RUNNING,
conf=dro.payload,
external_trigger=True)
session.add(dr)
session.commit()
count = count + 1
else:
self.log.info("Criteria not met, moving on")
if count == 0:
raise AirflowSkipException('No external dags triggered')
with a python_callable like
def trigger_preprocessing(context):
for base_filename,_ in found.items():
exp = context['ti'].xcom_pull( task_ids='parse_config', key='experiment')
run_id='%s__%s' % (exp['microscope'], datetime.utcnow().replace(microsecond=0).isoformat())
dro = DagRunOrder(run_id=run_id)
d = {
'directory': context['ti'].xcom_pull( task_ids='parse_config', key='experiment_directory'),
'base': base_filename,
'experiment': exp['name'],
}
LOG.info('triggering dag %s with %s' % (run_id,d))
dro.payload = d
yield dro
return
and then tie it all together with:
t_trigger_preprocessing = TriggerMultipleDagRunOperator( task_id='trigger_preprocessing',
trigger_dag_id='preprocessing',
python_callable=trigger_preprocessing
)
I developed a simple app in MIT APP Inventor that controls a heat pump water heater.
The app sends a different string for each button pressed and the NodeMcu verifies which button was pressed, as you can see in the code below.
srv=net.createServer(net.TCP)
srv:listen(80,function(conn)
conn:on("receive", function(client,request)
local buf = ""
local _, _, method, path, vars = string.find(request, "([A-Z]+) (.+)?(.+) HTTP")
if(method == nil)then
_, _, method, path = string.find(request, "([A-Z]+) (.+) HTTP")
end
local _GET = {}
if (vars ~= nil)then
for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do
_GET[k] = v
end
end
local _on,_off = "",""
if(_GET.pin == "ip")then
local ip=wifi.sta.getip()
local ler_ip=string.sub(ip,1,13)
dofile("novolcd.lua").cls()
dofile("novolcd.lua").lcdprint("IP="..ler_ip)
elseif(_GET.pin == "05a60")then
sp_temperaturas[5]=60
elseif(_GET.pin == "06a60")then
sp_temperaturas[6]=60
elseif(_GET.pin == "Ferias")then
dofile("novolcd.lua").cls()
dofile("novolcd.lua").lcdprint(" Modo ferias ")
modo_ferias()
elseif(_GET.pin == "Parar2")then
dofile("novolcd.lua").cls()
dofile("novolcd.lua").lcdprint(" Parar")
end
end)
conn:on("sent", function (c) c:close() end)
end)
And when the button "Ferias" is pressed the system starts the heating process by calling the function modo_ferias().
function aquecer()
local kp=100/10
local ki=5
local kd=5
local tempo_on=0
local tempo_off=0
i=0
local duty=0
erro=sp_temp-t_atual
soma_erro = soma_erro + erro/5;
dif_erro = (erro - erro_ant)/5;
erro_ant = erro;
print(erro.." "..soma_erro.." "..dif_erro)
duty= kp * erro + soma_erro / ki + dif_erro * kd
print(duty)
tempo_on= duty *50
if (tempo_on > 5000) then
tempo_on = 5000
end
tempo_off = 5000 - tempo_on
repeat
i = i + 1
tmr.delay(1000)
until (i >= tempo_off)
gpio.write(8, gpio.HIGH)
repeat
i = i + 1
tmr.delay(1000)
until (i == 5000)
gpio.mode(8, gpio.INPUT)
end
function modo_ferias()
repeat
sair_ferias=0
pressao()
if (pressao_psi <=3)
sair_ferias=1
end
t_atual=ler_temperatura()
local int = string.format("%d", t_atual ) -- parte inteira
local dec = string.format("%.1d", t_atual % 10000) -- parte decimal com uma casa
t_display = int .. "." .. dec
rtc()
dofile("novolcd.lua").cls()
dofile("novolcd.lua").lcdprint("Temp="..t_display.." ST="..sp_temp..data_horas)
sp_temp=40
local horas_ferias=hour
if(horas_ferias==0 or horas_ferias==1 or horas_ferias==2 or horas_ferias==3 or horas_ferias==4 or horas_ferias==5 or horas_ferias==6) then
sp_temp=70
end
if (sp_temp>t_atual) then
aquecer()
end
until (sair_ferias==1)
end
And here is where my problem appears. If I press a button form the app after the "Ferias" button been pressed, the NodeMcu won't know it because the program is in the heating functions and not verifying if the app sended any instruction.
Is there any way to listen the app commands and to do the heating process at the same time?
There are a few things
Global state
because the program is in the heating functions and not verifying if the app sended any instruction
If the commands triggered by pressing the various buttons can not run independently from each other then you need some form of global state to make sure they don't interfere.
Busy loop
repeat
i = i + 1
tmr.delay(1000)
until (i == 5000)
This is a no-go with NodeMCU as it's essentially a stop-the-world busy loop. Besides, tmr.delay is scheduled to be removed because it's abused so often.
Task posting
node.task.post is a possible solution to scheduling tasks for execution "in the near future". You could use this to post task from the on-receive callback rather executing them synchronously.
I want to insert an array using a graphical interface, but I don't understand why I get these errors:
Error using waitfor
Undefined function or variable 'A'.
Error using waitfor
Error while evaluating uicontrol Callback
THE CODE:
function read()
clear all
clc
n=2;
b=50;
a=300;
B = nan(n);
S.fh = figure('units','pixels',...
'position',[500 500 500 500],...
'menubar','none',...
'numbertitle','off',...
'name','Matrix',...
'resize','off');
for i=1:n
for j=1:n
A(i,j) = uicontrol('style','edit','units','pixels',...
'position',[b a 50 50],'fontsize',20,'string','',...
'Callback', 'B(A == gco) = str2double(get(gco, ''string''));');
b = b+60;
end
b = 50;
a = a-60;
end
S.bb = uicontrol('style','push',...
'units','pixels',...
'position',[300 10 75 50],...
'fontsize',14,...
'string','Done',...
'callback','close');
waitfor(S.fh)
B
Instead of using callbacks for all the edit boxes separately, I recommend a single callback that reads all the values on the button. For instance:
function read()
clear all
clc
n=2;
b=50;
a=300;
% A = zeros(n);
S.fh = figure('units','pixels',...
'position',[500 500 500 500],...
'menubar','none',...
'numbertitle','off',...
'name','Matrix',...
'resize','off');
for i=1:n
for j=1:n
A(i,j) = uicontrol('style','edit','units','pixels',...
'position',[b a 50 50],'fontsize',20,'string','');
% no callback for the edit boxes
b = b+60;
end
b = 50;
a = a-60;
end
S.bb = uicontrol('style','push',...
'units','pixels',...
'position',[300 10 75 50],...
'fontsize',14,...
'string','Done',...
'callback',#(~,~)(readvalues(A,n)));
% callback that reads all the values in one run
% (and closes the figure as you wanted)
waitfor(S.fh)
function readvalues(A,n)
B = zeros(n);
for i=1:n
for j=1:n
B(i,j) = str2double(get(A(i,j), 'String'));
end
end
disp(B)
close
I am using an API to get real data times of trains and am trying to get the closest train time to a user entered time and then display that train time, and the next 4 granted the trains are running. I am reading in the information and the code goes through what its supposed to do but when I look at the array its a bunch of [] brackets in 7 cells instead of the calculated numbers. Any suggestions? Code is below with the API
TEST VALUES:
requestStationSelected = 'University%20City' and requestEndStation = 'Roslyn'
%this is the API link for the live data from Septa this will get 30
%results and see which time is closer to the user entered time
requestInfoSeptaLive = ['http://www3.septa.org/hackathon/NextToArrive/' requestStationSelected '/' requestEndStation '/30'];
%Again tries to get the information and if there is a failure it will give
%a probable cause and terminate the program
try
getInfoSeptaLive = urlread(requestInfoSeptaLive);
catch
if getInfoSeptaLive ~= '[]'
disp...
('Either the arrival/depart stations dont quite match up or theres a server error. Try again.');
return;
else
disp('Unable to fetch the information from Septa, please try again')
return;
end
end
%parses the information returned from the Live API
dataReturnedFromLiveAPI = parse_json(getInfoSeptaLive);
dataReturnedFromLiveAPI = dataReturnedFromLiveAPI{1};
%gets the size of the API in case there are no trains running
sizeOfDataNoTrains = size(dataReturnedFromLiveAPI, 1);
sizeOfData = size(dataReturnedFromLiveAPI, 2);
counter = 0;
for i = 1:sizeOfData
scanForClosestTime = dataReturnedFromLiveAPI{1,i}.orig_departure_time;
trainTimeGivenH = sscanf(scanForClosestTime, '%i');
findColonTrain = strfind(scanForClosestTime, ':');
trainTimeGivenMStr = scanForClosestTime(findColonTrain+1:4);
trainTimeGivenM = int32(str2num(trainTimeGivenMStr));
trainDepartTimeM = (trainTimeGivenH(1,1) * 60) + (trainTimeGivenM);
differenceBetweenTimes = trainDepartTimeM - userEnteredMins;
if trainDepartTimeM < userEnteredMins
differenceBetweenTimes = userEnteredMins - trainDepartTimeM;
end
stopAtEndOfData = sizeOfData;
goodTimeFrame = 60;
closestTime = cell(1, stopAtEndOfData);
storeTheDifference = cell(1, stopAtEndOfData);
if(differenceBetweenTimes < 60)
if (counter < 5)
closestTime{i} = scanForClosestTime;
storeTheDifference{i} = differenceBetweenTimes;
counter = counter + 1;
end
end
end
You assign your cell arrays inside the for loop:
for i = 1:sizeOfData
...
closestTime = cell(1, stopAtEndOfData);
storeTheDifference = cell(1, stopAtEndOfData);
...
end
This means that you turn both of them into an array of {[],[],[],[],[]...} on every iteration of the loop - so unless the last iteration has a valid "closest Time" in it, your cell array will be all empty arrays - and if it does, all but the last element will still be [].
To fix this, move the two lines to before the start of the for loop.
The second problem seems to be the indexing of the arrays where you store the results. If you only want five results, I am assuming you want to store them in elements 1 - 5 of your array, and not in "just any" locations. I would change the code to
if (counter < 5)
counter = counter + 1;
closestTime{counter} = scanForClosestTime;
storeTheDifference{counter} = differenceBetweenTimes;
end
But maybe I misinterpreted how you want to handle that?
Unrelated to your question, you might want to take a look at the line
trainTimeGivenMStr = scanForClosestTime(findColonTrain+1:4);
It is quite possible that this is not what you intended to do - looking at an example of the response, I found the string "orig_departure_time":"11:57PM". I expect that findColonTrain == 3, so that the above line becomes
trainTimeGivenMStr = scanForClosestTime(4:4);
just a single character. Perhaps you meant
trainTimeGivenMStr = scanForClosestTime(findColonTrain+(1:4));
which would turn into
trainTimeGivenMStr = scanForClosestTime(4:7);
so that
trainTimeGivenMStr = '57PM';
I hope these three things help you get it all working!
EDIT: had a chance to run your code this morning - discovered a number of other problems. I include below an annotated "working" code: the biggest problem was most likely that you were not handling AM/PM in your code. Note that I used a different json parser - this changed a couple of lines very slightly. I'm sure you can put it back together to work the way you want. This returned valid data in all cells.
dataReturnedFromLiveAPI = loadjson(getInfoSeptaLive);
% next line not needed - loadjson returns struct array, not cell array
%dataReturnedFromLiveAPI = dataReturnedFromLiveAPI{1};
%gets the size of the API in case there are no trains running
sizeOfDataNoTrains = size(dataReturnedFromLiveAPI, 1);
sizeOfData = size(dataReturnedFromLiveAPI, 2);
counter = 0;
stopAtEndOfData = sizeOfData;
closestTime = cell(1, stopAtEndOfData);
storeTheDifference = cell(1, stopAtEndOfData);
userEnteredMins = 12*60+30; % looking for a train around 12:30 pm
for ii = 1:sizeOfData
scanForClosestTime = dataReturnedFromLiveAPI(ii).orig_departure_time;
trainTimeGivenH = sscanf(scanForClosestTime, '%i');
% since we'll be considering AM/PM, have to set 12 = 0:
if (trainTimeGivenH == 12), trainTimeGivenH = 0; end
findColonTrain = strfind(scanForClosestTime, ':');
% change next line to get minutes plus AM/PM:
trainTimeGivenMStr = scanForClosestTime(findColonTrain+(1:4));
% look at just minutes:
trainTimeGivenM = int32(str2num(trainTimeGivenMStr(1:2)));
% adjust for AM/PM:
if(trainTimeGivenMStr(3:4)=='PM'), trainTimeGivenH = trainTimeGivenH+12; end;
% compute time in minutes:
trainDepartTimeM = (trainTimeGivenH * 60) + (trainTimeGivenM);
differenceBetweenTimes = trainDepartTimeM - userEnteredMins;
if trainDepartTimeM < userEnteredMins
differenceBetweenTimes = userEnteredMins - trainDepartTimeM;
end
% added a couple of lines to see what is happening:
fprintf(1, 'train %d: depart %s - in minutes this is %d vs user entered %d\n', ...
ii, scanForClosestTime, trainDepartTimeM, userEnteredMins);
goodTimeFrame = 60;
if(differenceBetweenTimes < 600)
if (counter < 10)
counter = counter + 1;
closestTime{counter} = scanForClosestTime;
storeTheDifference{counter} = differenceBetweenTimes;
end
end
end