Send data via UART from ESP8266 (NodeMCU) to Arduino

I want to send data from my ESP8266 device to Arduino Uno board via UART.

ESP8266 has been minimized with NodeMCU firmware (build has the following timestamp:) nodemcu-master-8-modules-2017-05-30-19-21-49-integer

. Firmware has been built using only the following modules: file, gpio, net, node, tmr, uart, websocket, wifi

. The ESP8266 board is an Adafruit Huzzah board.

The ESP board is powered via a serial cable from my USB port. The cable I'm using is this one that gives me 5V to power my board and I know the USB on my Mac can supply 500mA,

The Arduino is also powered by another USB port on my computer.

The ESP board and Arduino are connected as follows:

ESP8266
TX        RX    GND
|         |     |
|         |     |
10        11    |
RX        TX    GND
Arduino

      

        
        
        
      

    

The Adafruit Huzzah board states that:

The TX pin is the output of the module and has 3.3V logic. The RX pin is the input to the module and corresponds to 5V (there is a level shift on this pin)

Thus, there should be no need for a level conversion between the two.

The code I'm running on the ESP8266 board because init.lua

:

uart.setup(0,115200,8,0,1)

tmr.alarm(0, 5000, 0, function()
  uart.write(0, "A", 19)
end)

      

        
        
        
      

    

The code I'm running on Arduino:

#include <SoftwareSerial.h>

#define rxPin 10
#define txPin 11

MeetAndroid meetAndroid;
SoftwareSerial sSerial(rxPin, txPin);
uint8_t lastByte;
uint8_t serialBuffer[64];
int count = 0;
int onboardLed = 13;


void setup() {
  pinMode(rxPin, INPUT);
  pinMode(txPin, OUTPUT);
  Serial.begin(115200);
  sSerial.begin(115200);
  pinMode(onboardLed, OUTPUT);
  digitalWrite(onboardLed, HIGH);

}

void loop() {
  while (sSerial.available() > 0) {
    serialBuffer[count] = sSerial.read();
    count++;
  }
  for (int i = 0; i < count; i++) {
    Serial.println(serialBuffer[i]);
  }
}

      

        
        
        
      

    

What I see on the Serial Monitor in Arduino when I reset my ESP board is garbage:

⸮⸮⸮⸮⸮⸮Z,⸮}⸮߿⸮ߏ⸮\⸮⸮LYLYLYLYL⸮L⸮L⸮L⸮L⸮L (((((⸮$⸮$⸮$⸮$⸮$⸮$⸮4⸮0⸮@⸮@⸮@⸮@⸮@⸮@⸮@⸮@⸮@⸮@⸮@⸮@ ((((⸮$:⸮&i(⸮⸮

      

        
        
        
      

    

After a little delay, it starts printing a line by line of garbage after that initial line. It's clear to me that there is a discrepancy somewhere.

I've searched for previous questions on this, but the only one I could find that came closest to my use simply stated that the docs should be read , which was not very helpful.

Does anyone know what is wrong here?