ping_pong

initiator ---> node

{
  "jsonrpc": "2.0",
  "method": "channels.system",
  "params": {
    "action": "ping"
  }
}

initiator <--- node

{
  "jsonrpc": "2.0",
  "method": "channels.system.pong",
  "params": {
    "channel_id": "ch_S8axer1izndZW5nt5Qi7e8gZsjDFi13S64RZkWSFzHYmUi3PJ",
    "data": {
      "action": "system",
      "tag": "pong"
    }
  },
  "version": 1
}

responder ---> node

{
  "jsonrpc": "2.0",
  "method": "channels.system",
  "params": {
    "action": "ping"
  }
}

responder <--- node

{
  "jsonrpc": "2.0",
  "method": "channels.system.pong",
  "params": {
    "channel_id": "ch_S8axer1izndZW5nt5Qi7e8gZsjDFi13S64RZkWSFzHYmUi3PJ",
    "data": {
      "action": "system",
      "tag": "pong"
    }
  },
  "version": 1
}