Simple Messaging App Download
Quirino Rico
Amazon Simple Notification Service (Amazon SNS) sends notifications two ways, A2A and A2P. A2A provides high-throughput, push-based, many-to-many messaging between distributed systems, microservices, and event-driven serverless applications. These applications include Amazon Simple Queue Service (SQS), Amazon Kinesis Data Firehose, AWS Lambda, and other HTTPS endpoints. A2P functionality lets you send messages to your customers with SMS texts, push notifications, and email.
The Simple Messaging Communication Library (STM) can enhance the performance, usability, maintainability and scalability of a distributed system by providing a simple but effective messaging layer in your application.
You may also consider using network-enabled Shared Variables in your application, which provide a high-level programming interface for data exchange between system components, but are not specifically designed for messaging.
In every messaging protocol there is some overhead (meta data) associated with parsing the data stream on the receiving end. Sending a complete set of meta data with every package adds significant overhead.
Since we are focusing on high-performance applications, we want to minimize the communication overhead by sending a reduced set of meta information with each packet. The approach used by the STM protocol is to create a separate "meta data" message containing an indexed list of meta information that is sent once whenever an STM connection is made between hosts. By doing this, each host has all of the information that it needs to decode subsequent messages. When sending a message, the host packetizes the data with a meta data index that the receiver can use to look up the decoding information.
You will see that by using this approach we are able to create an abstraction from the transport layer, where the user sends and receives data by name. The underlying transfer mechanism is completely hidden.
The STM API is very simple. For basic operation it consists of a Read VI and a Write VI. There are also two supplemental VIs to transmit the Meta Data, but their use is not mandatory. Each of the main VIs are polymorphic which allows for the use with different transport layers. The API for each layer is very similar. The following is a brief description of the main API VIs (only the TCP/IP versions are shown). Additional utility VIs are installed as well and are documented in the VI Help.
STM Write Message: Use this VI to send any type of data to a remote host. This VI creates a packet based on the data, the data name and meta data information. When this VI is called, it retrieves the index of the variable specified by Name in the meta data array. It then assembles the message packet and sends it to the remote host via TCP/IP using the connection ID.
Also note that the application flattens the data to a string before it is sent. For simple data types (including those shown in Figure 3) it is possible to use a typecast, which is slightly faster than the Flatten to String VI. However Flatten to String also works with complex data types such as clusters and waveforms.
Receiving data is also very simple. The design pattern shown in Figure 4 waits for the meta data when the connection is established with the server. It then uses the STM Read Message VI to wait for incoming messages. When a message is received, it converts the data and assigns it to a local value according to the meta data name.
This example explores how to implement the Observer pattern using a Publish-Subscribe Channel. It considers distribution and threading issues and discusses how messaging greatly simplifies these issues. The example shows how to implement both the push and pull models of notification and compares the consequences of each. It also explores how to design an adaquate set of channels needed for a complex enterprise with numerous subjects notifing numerous observers.
The STM code contains a set of simple VIs which implement the API and currently VIs are provided for TCP, UDP and RS-232 as the transport layer. Due to its simple nature it can be easily implemented on other transport layers. For example if you want to send various messages or data items between a LabVIEW FPGA target and its host, you can implement STM using the DMA transfer as the transport layer.
There is value in being able to articulate one way of doing something. When we are just learning, there has to be one way of doing things that will work for many of the situations we are most likely to encounter. That one way needs to be simple enough that the beginner can understand what to do, how to do it, and be assured some degree of success.
Short Message/Messaging Service, commonly abbreviated as SMS, is a text messaging service component of most telephone, Internet and mobile device systems. It uses standardized communication protocols that let mobile devices exchange short text messages. An intermediary service can facilitate a text-to-voice conversion to be sent to landlines.[1]
Mobile marketing, a type of direct marketing, uses SMS.[8] The global SMS messaging business was estimated to be worth over US$240 billion in 2013, accounting for almost half of all revenue generated by mobile messaging.[9]
Adding text messaging functionality to mobile devices began in the early 1980s. The first action plan of the CEPT Group GSM was approved in December 1982, requesting that "The services and facilities offered in the public switched telephone networks and public data networks ... should be available in the mobile system."[10] This plan included the exchange of text messages either directly between mobile stations, or transmitted via message handling systems in use at that time.[11]
The first commercially sold SMS service was offered to consumers, as a person-to-person text messaging service by Radiolinja (now part of Elisa) in Finland in 1993. Most early GSM mobile phone handsets did not support the ability to send SMS text messages, and Nokia was the only handset manufacturer whose total GSM phone line in 1993 supported user-sending of SMS text messages. According to Matti Makkonen, an engineer at Nokia at the time, the Nokia 2010, which was released in January 1994, was the first mobile phone to support composing SMSes easily.[33]
SMS was originally designed as part of GSM, but is now available on a wide range of networks, including 3G networks. However, not all text messaging systems use SMS, and some notable alternative implementations of the concept include J-Phone's SkyMail and NTT Docomo's Short Mail, both in Japan. Email messaging from phones, as popularized by NTT Docomo's i-mode and the RIM BlackBerry, also typically uses standard mail protocols such as SMTP over TCP/IP.[citation needed]
SMS is being increasingly challenged by Internet Protocol-based messaging services such as RCS, Apple's iMessage, Signal, Facebook Messenger/WhatsApp, Telegram, Viber, WeChat (in China) and Line (in Japan), available on smart phones with internet connections.[41] For example, between 2010 and 2022, SMS telecom revenue in India dropped 94 percent, while "revenue share per user from data usage...grew over 10 times."[42]
SMS gateway providers facilitate SMS traffic between businesses and mobile subscribers, including SMS for enterprises, content delivery, and entertainment services involving SMS, e.g. TV voting. Considering SMS messaging performance and cost, as well as the level of messaging services, SMS gateway providers can be classified as aggregators or SS7 providers.[citation needed]
Another type of SMS gateway provider is based on SS7 connectivity to route SMS messages, also known as "international termination model". The advantage of this model is the ability to route data directly through SS7, which gives the provider total control and visibility of the complete path during SMS routing. This means SMS messages can be sent directly to and from recipients without having to go through the SMSCs of other mobile operators. Therefore, it is possible to avoid delays and message losses, offering full delivery guarantees of messages and optimized routing. This model is particularly efficient when used in mission-critical messaging and SMS used in corporate communications. Moreover, these SMS gateway providers are providing branded SMS services with masking but after misuse of these gateways most countries' governments have taken serious steps to block these gateways.[citation needed]
Visually, this style of representation provides a back-and-forth chat-like history for each individual contact.[66] Hierarchical-threading at the conversation-level (as typical in blogs and on-line messaging boards) is not widely supported by SMS messaging clients. This limitation is due to the fact that there is no session identifier or subject-line passed back and forth between sent and received messages in the header data (as specified by SMS protocol) from which the client device can properly thread an incoming message to a specific dialogue, or even to a specific message within a dialogue.
Most smart phone text-messaging-clients are able to create some contextual threading of "group messages" which narrows the context of the thread around the common interests shared by group members. On the other hand, advanced enterprise messaging applications which push messages from a remote server often display a dynamically changing reply number (multiple numbers used by the same sender), which is used along with the sender's phone number to create session-tracking capabilities analogous to the functionality that cookies provide for web-browsing.[citation needed] As one pervasive example, this technique is used to extend the functionality of many Instant Messenger (IM) applications such that they are able to communicate over two-way dialogues with the much larger SMS user-base.[67] In cases where multiple reply numbers are used by the enterprise server to maintain the dialogue, the visual conversation threading on the client may be separated into multiple threads.[citation needed]
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