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simcom

gps active antenna with long cable
Product Documentation

Using GPS – ESP32 Gateway with Simcom Modem

Using the built-in GPS, ESP32 Gateway can obtain a fix on its current location and also acquire current time. This makes IoT asset tracking easier.

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esp32 4g gateway gen1 sim7600 4g modem ethernet rs485 enclosure features
News

ESP32 4G Gateway Gen.1 Design – Prototype and Testing

News and Updates on the ESP32 4G Gateway Gen.1 which features a 4G LTE modem, ethernet, RS485 and solar power with a battery charger.

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esp32 modem command timeout value setting for esp_modem_dte_send_cmd
ESP32 4G Gateway (Gen 1)

esp_modem_dte_send_cmd: process command timeout – SOLVED

ESP32 PPPoS modem “esp_modem_dte_send_cmd(): process command timeout” error, causes, and some solutions that work with SIM7600 and A7670.

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simcom modem gpio for multiple sim switch
Embedded

Using Multiple SIM Cards with Cellular Modems (SIMCom, Quectel, etc)

Using multiple SIM cards with SIMCom or Quectel modems is easy using multiplexers and a basic logic controller. Modems must support hot swap.

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ERROR SIM Failure simcom voltage drop
Embedded

“ERROR: SIM Failure” in Simcom 4G LTE Modems – Solutions

I list some cases with using SIM commands like AT+CIMI which result in “ERROR: SIM failure”. Common problems are listed along with solutions.

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