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vshymanskyy/TinyGSM
A small Arduino library for GSM modules, that just works
TinyGSM is an Arduino library that wraps the AT command sets of dozens of GSM/cellular modem families (SIM800/900/7000/7600, u-blox, Quectel, XBee, plus ESP8266/ESP32 AT mode) into a single standard Arduino Client interface. It's for embedded developers building cellular or GPRS-connected devices on constrained MCUs like an Uno or Nano.
Normalizes wildly inconsistent AT command dialects across dozens of modem chips so a sketch written for HTTP/MQTT/Blynk over Ethernet or WiFi ports over almost unchanged. Genuinely small footprint — 15KB flash and 574B RAM in the WebClient example, smaller than Arduino's own GSM library. Broad, actively maintained modem matrix with per-chip capability documentation (simultaneous TCP connections, SSL support, GPS, USSD) so you know upfront what a given modem can't do. Diagnostics and FactoryReset sketches plus StreamDebugger integration make bring-up on flaky serial hardware far less painful than debugging raw AT commands by hand.
Entirely blocking I/O — gprsConnect() and client.connect() can stall for minutes on poor signal, which is a real constraint if the sketch needs to do anything else concurrently. No SMS receiving, no UDP, and SSL/voice/USSD support varies per modem, so you have to cross-check the support matrix before picking hardware. No abstraction for module power sequencing or reset pins; the README itself admits power supply issues are the most common cause of failures, and you're left to write that logic yourself. LGPL-3.0 licensing is friction for anyone shipping closed firmware without dynamic linking, unlike the MIT/Apache norm for most Arduino libraries.