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Hourly - Intermediate ($$) - Est. Time: Less than 1 week, 10-30 hrs/week - Posted
We have a script that connects a Web Call to USB device. The main scenario is, we have a tablet application, which is on WiFi, It sends a URL call via local Wifi to some Lighting Hardware connected via USB to a RaspberryPi, which is running Apache/PHP etc. So from a browser you can type: It will go to the script, and send a message to the USB device. The issue is, that when we send many of these URL calls, once in a while it freezes randomly with no apparent pattern, it seems the USB port or connection is left open or something, that does not allow the next call in. Then it will start working again after a next call. So, we want to remove any chance of this freeze. The simple PHP code we are using is: <?php if($_GET['communication_board_command']){​ ini_set('display_errors', 1); $codes = explode(",",$_GET['communication_board_command']); foreach( $codes as $code){​ eval("\$code = $code;"); echo "\n lighting-code-sent"; echo $code; file_put_contents("/dev/ttyUSB0", $code); file_put_contents("/dev/ttyUSB1", $code); }​ echo "\n php-ok1"; }​ ?> So this works fine, and a command is sent to the USB, and the lighting board connected lights. However, sometimes it does not, and the call is ignored, or it stays lit with the old code sent when a new one is sent. We have tried sending the code twice, or with a usleep delay, or via calling a redirected script twice. We have tried with fopen(), fwrite(), fclose(); But it has no effect... sometimes there is still a Pause. --- If we run the same script on Windows, WAMP setup, it works fine, it does not seem to have the delay as on Linux / RaspberryPi, The script on Windows is: <?php error_reporting(E_ALL & ~E_NOTICE & ~E_DEPRECATED); if($_GET['lcode']){​ ini_set('display_errors', 1); `mode com3: BAUD=38400 PARITY=N data=8 stop=1 xon=off`; $codes = explode(",",$_GET['lcode']); foreach( $codes as $code){​ eval("\$code = $code;"); echo "\n lighting-code-sent"; echo $code; file_put_contents(com3, $code); }​ }​ echo "\n php-ok"; ?> As above we can set the Baud, Parity etc. But on Linux, it does not seem like this is done, when trying the same code. Or its set somewhere else previously? And it calls the COM port, via USB/Serial drivers. It just seems on windows, the socket call is dealt with differently, and the issue will not happen. --- In anycase we need help with this code on Raspberry Pi, to have the Web Call sent but not have any Freezes / Pauses, so that the USB call, is opened and closed, and can have multiple calls in a regular frequency, as per any local web call. - Another issue is when we plug in the USB cannot be sure if it will go to /dev/ttyUSB0 or /dev/ttyUSB1 which is why have them both there, or if the USB is taken out, sometimes its lost if reconnected... so another task is to always get the USB to ttyUSB0 and allow the script to call it. So for now we need help with these 2 points, and there might be others, as the projects progresses, as we need to create a very stable system for these Web Calls. As above its currently done in PHP, but I dont mind using Python to do it, or other scripts / executables, but we do need to have full understanding and control of whats happening. Can be Pay by the hour or a fixed price.
Skills: Bash shell scripting Debian OS Linux System Administration PHP
Fixed-Price - Intermediate ($$) - Est. Budget: $10 - Posted
We are looking for a mix of ~300 word articles, top 10 lists, breaking news with some accompanying text. Positive articles, no bashing celebrities or any other that kind. Happy fun articles, that readers would love read.
Hourly - Intermediate ($$) - Est. Time: More than 6 months, 10-30 hrs/week - Posted
you need to have the following skills/experience working with Bash and python scripts AWS servers and HA solutions must have experience with large networks just to make sure you have read this message and i dont get spam application please start your message with iplay247
Skills: Bash shell scripting Amazon EC2 CentOS Python
Hourly - Expert ($$$) - Est. Time: More than 6 months, 30+ hrs/week - Posted
Required: Solid knowledge of programming languages: Python, C, golang; Good understanding of Linux, bash / sh scripting English: Intermediate + Advantageous: Understanding of Openstack, Ansible, sstorage protocols such as SCSI and NVMe, NAND flash management.
Skills: Bash Bash shell scripting C++ Golang
Hourly - Entry Level ($) - Est. Time: More than 6 months, 10-30 hrs/week - Posted
Integrate software for online storage : i2p tor tahoe lafs and owncloud List of task to be done: Setup the lab: Owncloud: Connect to tahoe lafs via external sftp I2p: Configure to work with tahoe and multiple introducer called foolscap Bash: Create a script that backup in tahoe several paths folder from linux Tahoe: Follow the dev and push for having the full integration of TOR and i2P working properly, additional budget will be release to bid in the official Tahoe dev group when every is clear
Skills: Bash shell scripting Internet Security Java JavaScript
Hourly - Expert ($$$) - Est. Time: More than 6 months, Less than 10 hrs/week - Posted
We use external libraries and maintain several robust internal libraries Google Analytics APIs and Event Tracking Facebook's APIs Deferred loading Systems Administrator Amazon Web Services familiarity, specifically EC2 instances & reserved instances EBS volumes and snapshots ELB load balancers Cloudwatch monitoring S3 storage Route53 DNS EC2 AMIs IAM authentication Pricing and estimating CLI interface Ubuntu Linux running on Amazon Web Services. Familiarity with building and administering Bash scripts Nagios NFS NTP Cron RAID OpenSSL Caches: Memcached, APC Apache, monitoring and tuning PHP, monitoring increasing/decreasing the size and swapping EC2 volumes w/ little-to-no downtime Comfortable building: Web servers Database servers NFS servers Development servers Database Administrator Postgres 9.1 Master to Hot-Standby replication, and hot-swap in case of emergency Database monitoring / tuning Query monitoring / tuning to detect and resolve hotspots Restoring a database backup from an S3 snapshot Increasing database size in a Master-Standby setup without downtime Graphic Designer/UI Ability to design layouts for a community site An understanding of responsive website concerns and their interaction with advertising Photoshop familiarity, esp. preparing images for social media Understanding of Spriting graphics for web optimization
Skills: Amazon S3 Kohana Linux System Administration Memcached PHP PostgreSQL Administration PostgreSQL Programming Ubuntu
Hourly - Intermediate ($$) - Est. Time: More than 6 months, 30+ hrs/week - Posted
Key Skills - Excellent HTML5/CSS skills - Advanced skills using JS and MVC Frameworks (AngularJS, ReactJS or similar) - Strong UI/UX design awareness and operational skills in Adobe CS Products - Some exposure to CSS meta-languages (SASS or LESS), scaffolding and build tools would be advantageous. - Operational Server Stack and bash terminal knowledge a big plus (Linux) - Basic understanding of APIs and Web Service concepts (REST or SOAP) is a must Additional Non-essential Skills - Solid skills in PHP or similar back-end technology would be very desirable - Native mobile app development workflow skills and/or experience - Understanding of Yii2 PHP & MongoDB
Skills: Adobe Photoshop CSS CSS3 Graphic design HTML5 JavaScript jQuery Web design
Hourly - Intermediate ($$) - Est. Time: 1 to 3 months, Less than 10 hrs/week - Posted
We specialize in multiple areas, but the technologies we are most familiar with are as follows: - Java - Apache Spark - Scala - Big Data - Spring Framework - ElasticSearch - SBT - Amazon Web Services (AWS) - SQL - Hadoop - Tableau - Git - Gradle - MongoDB - Redis - PHP - HTML5 - CSS3 - JavaScript - iOS App Development - Android App Development - Linux - Bash & Bash Scripting - HTML - UI/UX Design - Branding / Identity - GitHub - New Relic - Heroku - Datadog - Qubole - Codeship - Matlab - IntelliJ IDEA - Continuous Integration (CI) - Test Driven Development (TDD) - Behavior Driven Development (BDD) - Object Oriented Programming (OOP) - Agile Methodologies - Scrum - Technical Recruiting We handle all aspects of software development from back-end, front-end, app development, infrastructure management, iOS and Android app development, web development, architecture design, and architecture development.
Skills: Cold calling Lead generation Sales