{
  "format": "evn-blocks",
  "version": 3,
  "title": "Bluetooth: minimal",
  "needs": "the Bluetooth module on serial port 2, and a phone (Android) or PC paired with it (PIN 1234) running a Bluetooth serial terminal app that ends each line it sends with a newline",
  "description": "A Bluetooth echo: the board says hello to the phone, then answers every line the phone sends with \"you said: ...\" and prints it on the computer too. Runs until you press Stop. Switch the board on without holding the module's button (held, the set-up reprograms the module's name, speed and role), and do not have the board's REPL on this module: while it runs over the module it takes what the phone sends, and its own Bluetooth object holds the port: Bluetooth(2) here then fails with \"OSError: serial port 2 is already open\". The Board view's broadcast button puts it there by writing `bt = evn.Bluetooth(2); bt.repl(True)` into boot.py; take that line out of boot.py and reset the board (a plain reset: the REPL stays on the module across a soft reboot).",
  "workspace": {
    "blocks": {
      "languageVersion": 0,
      "blocks": [
        {
          "type": "evn_setup_start",
          "x": 30,
          "y": 30,
          "next": {
            "block": {
              "type": "evn_bluetooth_setup",
              "fields": {
                "PORT": "2"
              }
            }
          }
        },
        {
          "type": "evn_program_start",
          "x": 30,
          "y": 115,
          "next": {
            "block": {
              "type": "evn_bluetooth_send",
              "fields": {
                "PORT": "2"
              },
              "inputs": {
                "TEXT": {
                  "shadow": {
                    "type": "text",
                    "fields": {
                      "TEXT": "Hello from EVN! Send me a line."
                    }
                  }
                }
              },
              "next": {
                "block": {
                  "type": "evn_forever",
                  "inputs": {
                    "DO": {
                      "block": {
                        "type": "controls_if",
                        "inputs": {
                          "IF0": {
                            "block": {
                              "type": "evn_bluetooth_any",
                              "fields": {
                                "PORT": "2"
                              }
                            }
                          },
                          "DO0": {
                            "block": {
                              "type": "variables_set",
                              "fields": {
                                "VAR": {
                                  "id": "v_line"
                                }
                              },
                              "inputs": {
                                "VALUE": {
                                  "block": {
                                    "type": "evn_bluetooth_line",
                                    "fields": {
                                      "PORT": "2"
                                    },
                                    "inputs": {
                                      "TIMEOUT": {
                                        "shadow": {
                                          "type": "math_number",
                                          "fields": {
                                            "NUM": 1000
                                          }
                                        }
                                      }
                                    }
                                  }
                                }
                              },
                              "next": {
                                "block": {
                                  "type": "text_print",
                                  "inputs": {
                                    "TEXT": {
                                      "block": {
                                        "type": "variables_get",
                                        "fields": {
                                          "VAR": {
                                            "id": "v_line"
                                          }
                                        }
                                      }
                                    }
                                  },
                                  "next": {
                                    "block": {
                                      "type": "evn_bluetooth_send",
                                      "fields": {
                                        "PORT": "2"
                                      },
                                      "inputs": {
                                        "TEXT": {
                                          "block": {
                                            "type": "text_join",
                                            "inputs": {
                                              "ADD0": {
                                                "shadow": {
                                                  "type": "text",
                                                  "fields": {
                                                    "TEXT": "you said: "
                                                  }
                                                }
                                              },
                                              "ADD1": {
                                                "block": {
                                                  "type": "variables_get",
                                                  "fields": {
                                                    "VAR": {
                                                      "id": "v_line"
                                                    }
                                                  }
                                                }
                                              }
                                            },
                                            "extraState": {
                                              "itemCount": 2
                                            }
                                          }
                                        }
                                      }
                                    }
                                  }
                                }
                              }
                            }
                          }
                        },
                        "next": {
                          "block": {
                            "type": "evn_wait",
                            "inputs": {
                              "TIME": {
                                "shadow": {
                                  "type": "math_number",
                                  "fields": {
                                    "NUM": 20
                                  }
                                }
                              }
                            }
                          }
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      ]
    },
    "variables": [
      {
        "name": "line",
        "id": "v_line"
      }
    ]
  }
}