Chat here is you are connecting ESP-xx type modules to existing AVR based Arduino

Moderator: igrr

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By martinayotte
#39878 Unfortunately, Arduino Uno has only 1 hardware serial.
So, your only choices is to lower SoftSerial baudrate, or forget about Uno.
There are plenty of other hardware choices, not only Mega2560.
You can use MapleMini clones, they use the STM32F103 which has 3x hardware serial, 2x I2C, 2x SPI and direct USB.
Those are also well supported under ArduinoIDE (http://stm32duino.com)