Automatic restart of workflows in node-red - automation

Question

I asked this question also in the node-red forum, but there is not much activity (compared to stackoverflow). So I try it here again. The motivation of my question is, that I sometime loose the connection to an OPC-UA-Server that requires restart of the flow to work again. I want to do this automatically in background, because the rare restart of the flow is no big issue - so I can live with it.
There is a thread https://discourse.nodered.org/t/how-to-restart-flows-automatically/12993 that is not really finished or solved.
I implemented the last example, but get error 400, so automatic restart of flow doesn't work. Is there any fool proof description how to do this?
EDIT:
This is the code:
[
{
"id": "3623f8cf.b4d2b8",
"type": "subflow",
"name": "restart flows",
"info": "",
"category": "",
"in": [
{
"x": 40,
"y": 80,
"wires": [
{
"id": "f24fbf79.77a74"
}
]
}
],
"out": [
{
"x": 960,
"y": 80,
"wires": [
{
"id": "cb4d3992.931138",
"port": 0
}
]
}
],
"env": [
{
"name": "user",
"type": "str",
"value": ""
},
{
"name": "password",
"type": "str",
"value": ""
}
],
"color": "#FF8888",
"inputLabels": [
"Injection"
],
"icon": "node-red/alert.svg"
},
{
"id": "f24fbf79.77a74",
"type": "function",
"z": "3623f8cf.b4d2b8",
"name": "Request Token",
"func": "var user = env.get('user');\nvar pass = env.get('password');\n\nif(user === undefined || user === null)\n{\n user = 'adminuser';\n}\nif(pass === undefined || pass === null)\n{\n pass = 'adminpass';\n}\n\nmsg.payload = {\n \"client_id\": \"node-red-editor\",\n \"grant_type\": \"password\",\n \"scope\": \"*\",\n \"username\": user,\n \"password\": pass\n}\nreturn msg;\n\n/*\nmsg.payload = {\n \"client_id\": \"node-red-editor\",\n \"grant_type\": \"password\",\n \"scope\": \"*\",\n \"username\": \"type or username\",\n \"password\": \"type your password\"\n}\nreturn msg;\n*/",
"outputs": 1,
"noerr": 0,
"x": 200,
"y": 80,
"wires": [
[
"3aedf561.e16f4a"
]
]
},
{
"id": "3aedf561.e16f4a",
"type": "http request",
"z": "3623f8cf.b4d2b8",
"name": "Token",
"method": "POST",
"ret": "txt",
"paytoqs": false,
"url": "http://servername:port/auth/token",
"tls": "",
"persist": false,
"proxy": "",
"authType": "",
"x": 390,
"y": 80,
"wires": [
[
"388fe2f5.639eee"
]
]
},
{
"id": "388fe2f5.639eee",
"type": "function",
"z": "3623f8cf.b4d2b8",
"name": "Confirm token",
"func": "// get the status of the request\nvar status = msg.statusCode;\nvar token = '';\nmsg.headers ={};\n\n//let node = feedback;\n\nswitch(status){\n case 200:\n node.log(\"Secure restart\");\n token = JSON.parse(msg.payload);\n token = 'Bearer '+token.access_token;\n msg.headers = {\n \"Authorization\": token,\n \"Node-RED-Deployment-Type\":\"reload\"\n }\n msg.payload =\"\";\n break;\n case 204:\n node.log(\"Secure without restart\");\n global.set('result','\tSuccess - with no further content');\n break;\n case 400:\n node.warn(\"Bad request\");\n break;\n case 401:\n node.warn(\"Not authorized\");\n break;\n case 403:\n node.warn(\"Forbidden\");\n break;\n case 404:\n node.log(\"Unsecure restart\");\n msg.headers = {\n \"Node-RED-Deployment-Type\":\"reload\"\n }\n break;\n case 409:\n node.warn(\"Version mismatch\");\n break;\n case 500:\n node.error(\"Server Error\");\n break;\n default:\n node.warn(\"Unknown Error\");\n break;\n}\n\nmsg.payload = \"\";\n\nsetTimeout(function() { node.send(msg) }, 10000);\n\nreturn null;",
"outputs": 1,
"noerr": 0,
"x": 580,
"y": 80,
"wires": [
[
"cb4d3992.931138"
]
],
"info": "Restart of Node-Red flows.\nWill check if the action needs security or not.\nNote: if the first 5 attemps return a statuscode 403 'forbidden'\nthen the server will break and only way to recover is then to\nrestart the service"
},
{
"id": "cb4d3992.931138",
"type": "http request",
"z": "3623f8cf.b4d2b8",
"name": "Restart",
"method": "POST",
"ret": "txt",
"paytoqs": false,
"url": "http://servername:port/flows",
"tls": "",
"persist": false,
"proxy": "",
"authType": "",
"x": 780,
"y": 80,
"wires": [
[]
]
}
]
The settings.js file is as follows:
adminAuth: {
type: "credentials",
users: [
{
username: "adminuser",
password: "adminpass",
permissions: "*"
},
Hope this helps.