Error in MCU get/post Json request

Job ID: 32759513

Budget: $30 – $250 USD

I have IoT system.
The platform is Thingsboard and the MCU is STM32, and the communication unit is SIM5300e.
It was working fine last week, now I cannot send or receive anything from MCU to the platform.
Related categories: Internet of Things (IoT) STM32