General • Connect two RPi Pico via Bluetooth to send /receive serial data

Code:

// A very simple Serial-over-BT app that reads input from the host and CAPITALIZES it.// Released to the public domain by Earle F. Philhower, III, in February 2023// Under Linux to connect to the PicoW// 1. Pair to the "PicoW Serial XX:XX..." device using your favorite GUI, entering a PIN of "0000"// 2. Execute "sudo rfcomm bind 0 00:00:00:00:00:00" to make a `/dev/rfcomm0" device, replacing the "00:00.." with the MAC as listed in the device name// 3. Run "minicom -D /dev/rfcomm0" and type away// 4. To remove the virtual serial port, execute "sudo rfcomm release rfcomm0"// Under Windows to connect to the PicoW// 1. Pair to the "PicoW Serial XX:XX..." device using the copntrol panel, ignoring any PIN it says to check for// 2. At this point you will have a new COM: port.  You may need to use the Device Manager to find it's number.// 3. Open up COMX: in your favorite terminal application and type away// Under Mac to connect to the PicoW// 1. Open System Preferences and go in the bluetooth section. You should find a bluetooth device called//    PicoW Serial XX:XX:... Click Connect button.// 2. A /dev/tty.PicoWSerialXXXX becomes available.// 3. Connect to this device with your favorite terminal application.#include <SerialBT.h>void setup() {  Serial1.setFIFOSize(128);  //Serial1.setRX(1);  //Serial1.setTX(0);  Serial1.begin(57600);  SerialBT.begin(57600);}void loop() {  while (SerialBT) {    while (SerialBT.available()) {      Serial1.write(SerialBT.read());    }    while (Serial1.available()) {      SerialBT.write(Serial1.read());    }  }}