Esp - now slave only receives messages when master has serial monitor open

[PaulosKapa]

Board

esp32 s2

Device Description

esp 32 s2 mini

Hardware Configuration

gpio 2-7 are connected to push buttons

Version

v3.0.0

IDE Name

Arduino IDE

Operating System

Windows 10

Flash frequency

40Mhz

PSRAM enabled

yes

Upload speed

115200

Description

I followed the code on the esp - now master and slave examples. The master sends data, but only when serial monitor is open. When I don't send the code to the Serial monitor, the message isn't sent I want to send a struct, so I can't use the snprintf command. The following code works, but only when the serial monitor of the master is open at arduino ide. Otherwise, the slave doesn't receive any messages. I haven't change anything else from the example code rather than the code i have below

Sketch

////master
Serial.println(String(sensorData.X) + ',' + String(sensorData.Y) + ',' + String(sensorData.Z)+ ',' +String(sensorData.shot) + ',' +  String(sensorData.actions) + ',' +String(sensorData.magId) +','+String(sensorData.unlock));

if (!broadcast_peer.send_message((uint8_t *) &sensorData, sizeof(sensorData))) {
    Serial.println("Failed to broadcast message");

///slave
void onReceive(const uint8_t *data, size_t len, bool broadcast) {
    SensorData sensorData;
   // Serial.printf("Received a message from master " MACSTR " (%s)\n", MAC2STR(addr()), broadcast ? "broadcast" : "unicast");
    memcpy(&sensorData, data, sizeof(sensorData));
    Serial.println(String(sensorData.X) + ',' + String(sensorData.Y) + ',' + String(sensorData.Z)+ ',' +String(sensorData.shot) + ',' +  String(sensorData.actions) + ',' +String(sensorData.magId) +','+String(sensorData.unlock));
  }

Debug Message

There is no debug message

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• [X] I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[lbernstone]

You are looping to see if Serial is established. If you are using USB-CDC as your serial port, this will not be true unless you plug something in there.

[PaulosKapa]

Thank you that was the answer.