HTTP SMS

HTTP SMS is a service that lets you use your android phone as an SMS Gateway to send and receive SMS messages. You make a request to the API which it triggers your android phone to send an SMS.

Quick Start Guide 👉 https://docs.httpsms.com

Why?

I'm originally from Cameroon and I wanted an automated way to send and receive SMS messages using an API. Unfortunately many countries don't support the ability to buy virtual phone numbers, and I could not find a good ready-made solution that could help me send/receive SMS messages using a mobile phone using an intuitive http API.

Technology

Web

The web interface https://httpsms.com is built using Nuxt and Vuetify. It is hosted as a single page application on firebase. The source code is in the web directory

API

The API https://api.httpsms.com is built using Fiber, Go and CockroachDB for the database. It rus as a serverless application on Google Cloud Run. The API documentation can be found here https://api.httpsms.com/index.html

// Sending an SMS Message using Go
client := htpsms.New(htpsms.WithAPIKey(/* API Key from https://httpsms.com/settings */))

client.Messages.Send(context.Background(), &httpsms.MessageSendParams{
    Content: "This is a sample text message",
    From:    "+18005550199",
    To:      "+18005550100",
})

Android App

The Android App is a native application built using Kotlin with material design principles. This app must be installed on an android phone before you can start sending and receiving SMS messages.

Features

Webhook

If you want to build advanced integrations, we support webhooks. The httpSMS platform can forward SMS messages received on the android phone to your server using a callback URL which you provide.

Back Pressure

In-order not to abuse the SMS API on android, you can set a rate limit e.g 3 messages per minute. Such that even if you call the API to send messages to 100 people, It will only send the messages at a rate of 3 messages per minute.

Message Expiration

Sometimes it happens that the phone doesn't get the push notification in time and I can't send the SMS message. It is possible to set a timeout for which a message is valid and if a message becomes expired after the timeout elapses, you will be notified.

API Clients

• Go: https://github.com/NdoleStudio/httpsms-go

Flows

Sending an SMS Message

sequenceDiagram
User->>+Http Sms API: Call /v1/messages/send API
Http Sms API-->>+Google Cloud Task: Schedule notification about new message
Http Sms API-->>-User: Respond with 202 (Accepted)
Google Cloud Task-->>+Http Sms API: [Async] Send notfication request
Http Sms API-->>-Android App: Send push notification about new message
Android App-->>Http Sms API: [Async] Fetch message
Android App-->>Android App: Send Message using Andoid SMS API
Android App-->>Http Sms API: [Async] Send result of sending SMS
Android App-->>Http Sms API: [Async] Send Delivery Report

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License

This project is licensed under the MIT License - see the LICENSE file for details