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SMSRoute Dev

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Joined on Jul 29, 2026

Jul 30

STOP Is Not a String Match: Building an Opt-Out State Machine That Survives Audits

#compliance #backend #sms #architecture

6 min read

Jul 30

Your Inbound SMS Webhook Is a Public Endpoint: HMAC Verification, Replay, and Out-of-Order Delivery

#security #webhooks #backend #api

6 min read

Jul 30

Your SMPP Bind Is Idle 90% of the Time: Window Size, RTT, and the Throughput Math

#sms #backend #performance #networking

6 min read

Jul 30

Parsing Phone Numbers Is Harder Than Parsing Dates: E.164, libphonenumber, and the Inputs That Break You

#webdev #python #javascript #programming

7 min read

Jul 30

Someone Is Draining Your SMS Budget: Rate-Limiting OTP Endpoints Against Enumeration and SMS Pumping

#security #sms #backend #redis

8 min read

Jul 30

Exactly-Once Is a Lie: Building Idempotent SMS Sending with Retries That Don't Double-Text Your Users

#api #distributedsystems #sms #backend

9 min read

Jul 29

Your SMS Says "Sent" but Never Arrived: A Field Guide to DLRs, SMPP Status Codes, and Carrier Filtering

#sms #webhooks #debugging #backend

7 min read

Jul 29

Why Your 160-Character SMS Became 3 Messages: GSM-7, UCS-2, and the Segmentation Math Nobody Reads

#sms #webdev #javascript #debugging

7 min read

Jul 29

Delivered is not delivered: SMS DLR status callbacks done right

#sms #webhooks #otp #api

6 min read

Jul 29

Your OTP resend button is a race condition (and it's charging you twice)

#otp #sms #idempotency #authentication

7 min read

Jul 29

Sending transactional SMS over plain HTTP: pricing, error codes, and DLR callbacks

#sms #api #http #webdev

9 min read

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