IOT · Microservices · Open Source Hardware · REST

Raspberry Pi Setup – Part II: IoT API Platform

Intro This is the second part in a series of posts on setting up a Raspberry Pi to fully utilize the Software & Hardware functionality of this platform to build interesting internet of things (IOT) applications. Part-I is here https://techiecook.wordpress.com/2016/10/10/raspberry-pi-ssh-headless-access-from-mac-and-installing-node-processing/ … this covered the following: Enable SSH service on the Pi Connect to Pi without a display or router –… Continue reading Raspberry Pi Setup – Part II: IoT API Platform

IOT · Open Source Hardware

Raspberry Pi Setup – Part I : Boot, SSH and Headless access

Intro Part I : Documenting the workflow/steps to setup my Raspberry Pi (2 B) – from Installing Raspbian to installing Node, Processing etc Goals: Enable SSH service on the Pi Connect to Pi without a display or router – headless access via Mac Steps Install Raspbian Boot your Pi Setup SSH Connect to Mac Troubleshoot Connection to Mac… Continue reading Raspberry Pi Setup – Part I : Boot, SSH and Headless access

BPMN · Camunda · Open Source Software · Uncategorized

Camunda BPM – Manual Retry

The Camunda BPM is a lightweight, opensource BPM platform (See here: https://camunda.com/bpm/features). The “Cockpit” application within Camunda is the admin dashboard where deployed processes can viewed at a glance and details of running processes are displayed by the process instance ids. Clicking on a process instance id reveals runtime details while the process is running – process variables,… Continue reading Camunda BPM – Manual Retry

API Gateway · High Performance Computing · Java

Java Application Memory Usage and Analysis

The Java Virtual Machine (JVM) runs standalone applications and many key enterprise applications like monolithic application servers, API Gateways and microservices. Understanding an tuning an application begins with understanding the technology running it. Here is a quick overview of the JVM Memory management JVM Memory: Stack and Heap form the memory used by a Java Application The… Continue reading Java Application Memory Usage and Analysis

API · High Performance Computing · Uncategorized

API Performance Testing with Gatling

The Problem “Our API Gateway is falling over and we expect a 6-fold increase in our client base and a 10-fold increase in requests, our backend service is scaling and performing well. Please help us understand and fix the API Gateway”  Tasks It was pretty clear we had to run a series of performance tests simulating… Continue reading API Performance Testing with Gatling

Java · Oracle SOA Suite · Technology

Oracle SOA Suite 11g BPEL – FTP Adapter: What’s my filename?

I was writing an FTP adapter for a client recently for a legacy integration project, when a couple of  requirements came up: 1) When reading the file from a remote location, the client wanted to use the filename as a data element. 2) When writing the file to a remote location, the client wanted the… Continue reading Oracle SOA Suite 11g BPEL – FTP Adapter: What’s my filename?

Java · Oracle SOA Suite · Technology

BPEL Error with Receive/Pick

Error: “Error(81): There is not an activity (receive/pick) to start the process” Fix:  Check the “Create Instance” checkbox on your Receive or Pick activity.   When do you see these errors? When you create a BPEL process and remove the default Receive/Reply components to receive/pick events from a queue or an FTP adapter for example.… Continue reading BPEL Error with Receive/Pick