The Awsm Dvlprz Blog

Tales of awesomazing adventures

Most examples for setting the RTC on an ESP32 use WiFi or Ethernet connection and the builtin SNTP library or the NTPClient library. However, if a device operates in an environment without WiFi over 3G (as in our case), setting the RTC is not so straightforward.

This is just a quick note to understand the workings of timeservers and synchronizing the RTC using SNTP over TCP and UDP connections.

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The SIM5360 series is a Dual-Band HSPA+/WCDMA and Quad-Band GSM/GPRS/EDGE module solution in a SMT type which supports HSPA+ up to 14.4Mbps for downlink data transfer. SIM5360 related documentation can be downloaded from SIMCom site.

This short note explains the AT commands needed to open the network and establish a TCP connection on the SIM5360A.

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