Read a UART via Agent Function

Agent

uart_response <- "dummy"

device.on("resp", function(data) {
  server.log(data)
});

function readUart(cmd) {
  device.send("req", cmd)
  
  // Blocking wait to receive response from the imp
  device.on("resp", function(data) {
    uart_response = data
  });
  return uart_response
}

server.log(readUart("adc"))

Device

uart <- hardware.uart12;
rxBuffer <- ""
local soh = 0x01
local etx = 0x03

function dataRx() {
  local i = 0
  local c = 0
  
  //Pull a byte from the UART FIFO
  local uart_blob = uart.readblob()
  
  for (i=0;i<uart_blob.len();i++)
  {
    c = uart_blob[i]
    //server.log(c)
    if (c != etx)
    {
      if (c != soh)
      {
        rxBuffer += format("%c",c);
      }
    }
    else
    {
      agent.send("resp", rxBuffer)
    }
  }
}
 
function getRequest(cmd) {
  server.log("Requesting"+cmd)
  rxBuffer = ""
  uart.write(soh);
  uart.write(cmd);
  uart.write(etx);
}
 
agent.on("req", getRequest);

uart.configure(9600, 8, PARITY_NONE, 1, NO_CTSRTS, dataRx);