A fatal error occurred: Failed to connect to ESP32: Invalid head of packet (0x00) When connect ESP32 to RN2483 #3054
Description
` * Uart TX -- GPIO3
- Uart RX -- GPIO1
- Reset -- GPIO15
- Vcc -- 3.3V
- Gnd -- Gnd
*/
#include <rn2xx3.h>
#include <SoftwareSerial.h>
#define RESET 15
SoftwareSerial mySerial(3, 1); // RX, TX !! labels on relay board is swapped !!
//create an instance of the rn2xx3 library,
//giving the software UART as stream to use,
//and using LoRa WAN
rn2xx3 myLora(mySerial);
// the setup routine runs once when you press reset:
void setup() {
// LED pin is GPIO2 which is the ESP8266's built in LED
pinMode(2, OUTPUT);
led_on();
// Open serial communications and wait for port to open:
Serial.begin(57600);
mySerial.begin(57600);
delay(1000); //wait for the arduino ide's serial console to open
Serial.println("Startup");
initialize_radio();
//transmit a startup message
myLora.tx("TTN Mapper on ESP8266 node");
led_off();
delay(2000);
}
void initialize_radio()
{
//reset RN2xx3
pinMode(RESET, OUTPUT);
digitalWrite(RESET, LOW);
delay(100);
digitalWrite(RESET, HIGH);
delay(100); //wait for the RN2xx3's startup message
mySerial.flush();
//check communication with radio
String hweui = myLora.hweui();
while(hweui.length() != 16)
{
Serial.println("Communication with RN2xx3 unsuccessful. Power cycle the board.");
Serial.println(hweui);
delay(10000);
hweui = myLora.hweui();
}
//print out the HWEUI so that we can register it via ttnctl
Serial.println("When using OTAA, register this DevEUI: ");
Serial.println(hweui);
Serial.println("RN2xx3 firmware version:");
Serial.println(myLora.sysver());
//configure your keys and join the network
Serial.println("Trying to join TTN");
bool join_result = false;
//ABP: initABP(String addr, String AppSKey, String NwkSKey);
join_result = myLora.initABP("02017201", "8D7FFEF938589D95AAD928C2E2E7E48F", "AE17E567AECC8787F749A62F5541D522");
//OTAA: initOTAA(String AppEUI, String AppKey);
//join_result = myLora.initOTAA("70B3D57ED00001A6", "A23C96EE13804963F8C2BD6285448198");
while(!join_result)
{
Serial.println("Unable to join. Are your keys correct, and do you have TTN coverage?");
delay(60000); //delay a minute before retry
join_result = myLora.init();
}
Serial.println("Successfully joined TTN");
}
// the loop routine runs over and over again forever:
void loop() {
led_on();
Serial.println("TXing");
myLora.tx("!"); //one byte, blocking function
led_off();
delay(200);
}
void led_on()
{
digitalWrite(2, 1);
}
void led_off()
{
digitalWrite(2, 0);
}`
When I run this code, it said
A fatal error occurred: Failed to connect to ESP32: Invalid head of packet (0x00)
A fatal error occurred: Failed to connect to ESP32: Invalid head of packet (0x00)
I have tried the way to press boot button but nothing happened. But when I disconnect my MCU to the chip, the uploaded can be completed. It seems like something wrong with RX and TX connection. But there is no results in monitor then.
I want to know whats the problem and how to solve it.
Thank you.
Kai