Flatten and filter multi-dimension JSON with JQ

I have the following JSON test.json:

[  {"status": {"+@state": "up"    },"address": {"+@addr": "10.10.10.1","+@addrtype": "ipv4"    },"ports": {"port": [        {"+@protocol": "tcp","+@portid": "80","state": {"+@state": "open"          }        },        {"+@protocol": "tcp","+@portid": "443","state": {"+@state": "closed"          }        }      ]    }  },  {"status": {"+@state": "down"    },"address": {"+@addr": "10.10.10.2","+@addrtype": "ipv4"    },"ports": {"port": [        {"+@protocol": "tcp","+@portid": "21","state": {"+@state": "closed"          }        },        {"+@protocol": "tcp","+@portid": "22","state": {"+@state": "closed"          }        }      ]    }  },  {"status": {"+@state": "up"    },"address": {"+@addr": "10.10.10.3","+@addrtype": "ipv4"    },"ports": {"port": [        {"+@protocol": "tcp","+@portid": "21","state": {"+@state": "closed"          }        },        {"+@protocol": "tcp","+@portid": "22","state": {"+@state": "closed"          }        }      ]    }  },  {"status": {"+@state": "up"    },"address": {"+@addr": "10.10.10.4","+@addrtype": "ipv4"    },"ports": {"port": [        {"+@protocol": "tcp","+@portid": "21","state": {"+@state": "open"          }        },        {"+@protocol": "tcp","+@portid": "22","state": {"+@state": "open"          }        }      ]    }  }]

Running jq --null-input '[ inputs | .[] | select( .status."+@state" == "up" and .ports.port[].state."+@state" == "open" ) | { address: .address."+@addr", port: .ports.port } ]' test.json gets me the following:

[  {"address": "10.10.10.1","port": [      {"+@protocol": "tcp","+@portid": "80","state": {"+@state": "open"        }      },      {"+@protocol": "tcp","+@portid": "443","state": {"+@state": "closed"        }      }    ]  },  {"address": "10.10.10.4","port": [      {"+@protocol": "tcp","+@portid": "21","state": {"+@state": "open"        }      },      {"+@protocol": "tcp","+@portid": "22","state": {"+@state": "open"        }      }    ]  },  {"address": "10.10.10.4","port": [      {"+@protocol": "tcp","+@portid": "21","state": {"+@state": "open"        }      },      {"+@protocol": "tcp","+@portid": "22","state": {"+@state": "open"        }      }    ]  }]

How do I flatten the port to one object per port, with the address and filter where the port state == "open"? For example, I would like the output to be:

[  {"address": "10.10.10.1","port": "80"  },  {"address": "10.10.10.4","port": "21"  },  {"address": "10.10.10.4","port": "22"  }]