As recommended by @Erel in this thread, I have commenced migrating the communications in my project from http to websocket, however it's not been as simple as I thought it would be.
In replacing the http based comms part of my project I hit some "roadblocks". So created a simple project to...
Pick a SINGLE File from Dialog box, Then upload it To a server on LAN Or Internet
I wrote this B4A To be very small, simple, & easy to understand on a beginners level
In Files Is the PHP script To handle single File upload And save As original filename
php creates And appends a...
Hi guys, I'm migrating an old system that I did some years in power builder.
I could not achieve a connection to the database, this is what I have:
In my user DSN (odbc) I have my database connected and it works like this for my old system.
I managed to find a jconn2.jar library in the sybase...
I am using this function to send commands to a server
private Sub SendCommand(workName As String, Command As String, Signature As Boolean, url as String)
Dim ToSing As String
If Signature Then
url = X_PrivateUrl
ToSing = "command=" & workName & "&" &...
This procedure starts from a freshly installed AWS EC2 Linux instance and installs a B4J server, named B4J.jar, configured as a daemon.
This tutorial assumes a basic knowledge of a Linux environment, expecially the vi editor.
SSH access with ec2-user
Device /dev/xvdh is available...
I have a B4J Server application implementing a REST API service with multiple Handler Class Modules.
In one of these class modules I need to use CallSubDelayed to raise a callback event which is used in a Wait For in a different class module.
Is this possible?
If so, how do I reference...
Hi all, have been combing through the boards, and I see bits and pieces of references for backend stuff, but nothing definitive (perhaps that's the answer) about which way to go as far as selecting the OS for the Virtual Private Server (VPS) and B4J/I/A.
For those that have experimented, any...
I create a ServerSocket and connect with two client to server
I can send messages from clients to server, but i can't find who is sending the message and can't answer to client!
is there any way that astreams_NewData event show sender socket object?
wanna use a local Proxy in B4J to avoid CORS Problems.
This is the Try:
Dim ho As String
Dim po As Int
Sub AppStart (Args() As String)
ho="192.168.043.075" 'local ip
Dim j As HttpJob
Here a small quick and dirty implementation of the modbus TCP protocol in B4J as a server / slave.
Please note that this is not a complete library!
The following limitations are:
-Only READING (not writing) of holding registers possible by modbus master(function code 03) from...
I understand how to use Wait For in a B4J Server Handler. However I have no idea how to pause a server handler class waiting for some data in a SQLite database to change.
Anyone so kind to help?
buongiorno a tutti, è da un po che tento di collegarmi al mio sqlserver ma non riesco in nessun modo.
Public mysql As JdbcSQL
Private driver As String = "com.mysql.jdbc.Driver"
'Private jdbcUrl As String = "jdbc:mysql://192.168.0.2:1433/SQLTutorial"
Private jdbcUrl As String =...
Who tried to use an Android device as the server that has been powered up during several months, or maybe year ?
How is the battery state if such usage ?
I think, now embedded control systems can be build basing on an Android device (also as server) + wired Ethernet LAN hosts of...
Buonasera, vorrei col mio telefonino creare un app che mi permetta di farel' update di dati che ho su un database aziendale.
Di solito su VB.net usavo laconnessione OLEDB o SQLclient esiste qualcosa di simile?
Quindi una volta aperta la connessione fare le query, le update ecc in sql.
Hi All, i'm working on a project which requires a device to send data over to a PC. I came across the MQTT library and I thought I would give it a try, i'm really amazed at how simple it is to set this up, whether running the MQTT Broker on a local P.C. or using one of the cloud host servers...
I have lost 3 days attempting at installing the B4i-Bridge on the actual device and I am about to give up.
My system is a MacBook Pro 2018 with 16 GB ram, B4i v4.30 installed on Windows 10 Enterprise running under Parallels Desktop 14.10, Build Server v4.30 installed on Mac side and attached to...
I'm trying to add the file download handler to JRDC2:
with this code on linux server:
Public Sub Initialize
Sub Handle(req As ServletRequest, resp As ServletResponse)
Dim out As OutputStream
Dim name As String =...
Hi, I would like to add webhook support to one of my B4J Server application.
I've not found anything about services, only client side.
Does anyone has an idea or piece of code to start from?
Can I achieve that with regular server code, or should I look at additional components?
Many thanks in...
I try to use this solution with ssl:
[Server] Data Collection Solution - Device, Desktop and Web reports
In the DataCollectionDesktop App i will use Username & Password...