Extend ESP32 UART interfaces, Is it possible?

[loboris]

ESP32 modules are quite cheap, so maybe the simplest solution would be to use 5 ESP32, each with it's own SIM900. They could interract via WiFi (or I2C, or SPI) with one of them acting as master ...

[Prasad]

Sorry for the late reply. But i'm wondering whether thats the best solution to go for? Isn't that a waste of resources even though ESP32 modules are cheap?

How about flow control solution as @WiFive suggested? I can init individual GSM900 module when it's needed while managing a queue.

Also i'm not going to use pre built ESP32 modules in my project instead i'm going to design my own PCB with the ESP32 chip itself.