Help Posting Values to SK
I think I must have misunderstood something major so I hope everyone can correct me.
I am trying to update a value in SK. Here is a test value json string
{"updates": [{"values": [{"path": "electrical.batteries.123.capacity.timeRemaining", "value": 3455}]}]}
Dropped into the data fiddler it updates perfectly.
I started writing python code to PUT this json via /signalk/v1/api/ having first successfully obtained a token via /signalk/v1/auth/login and added it to the header.
I've tried this in Python / Circuit Python / MicroPython and the SK server responds with "SyntaxError: Unexpected token " in JSON at position 0"
I've tried using Websockets in Python (on a PC) using the same Json and it posts fine to SK, but this is a bit tricky to port to Micropython.
I've tried cutting out Python and using Postman and PUT and it returns "input is missing a value" (see picture)
I've then tried posting via UDP port 8375 but I don't see the data appear in SK.
Please can you point me in the right direction here?
1. Can I post data to SK via /signalk/v1/api/ or is this just for reading data ?
2. Is my Json example correct in the context of externally posting?
3. I assume I always need to login in and get a token to post, is this correct and can I add the token to the json string if I was trying to send via UDP. ?
Thanks in advance for any help!
9 Replies
An HTTP PUT requires a plugin to handle the path, by default the server does not accept these requests.
If you have security enabled then you will need to include credentials with the request.
A simple way to test PUT requests is to enable Alarms in Freeboard-SK plugin config and then you can
PUT /signalk/v2/api/notifications/mob which should raise a man over board alarm.but to get data into the server it's easier to send them via websocket
not sure it this helps but I use this to create sigk data in micropython, then send it UDP>
def createSigKdata(self, path, value):
try:
_sigKdata = {"updates": [{"values":[]}]}
_sigKdata["updates"][0]["values"].append( {"path":path,"value": value})
MESSAGE = (ujson.dumps(_sigKdata))
return MESSAGE
except Exception as e:
print("Create signalk error occurred = ",e)
thank you everyone
Thanks Paddy. When sending over UDP how are you authenticating with SK?
There is no auth for UDP, but you need to configure the connection on the server, it is not there out of the box
Thanks. Is that done here?
I send from an ESP32, it connects to openplotter network then this sends the data to a connection set up in the server as you posted above >
def insertIntoSigKdata(self, message):
try:
UDP_IP = "10.42.0.1"
UDP_PORT = 10120
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.sendto(message, (UDP_IP, UDP_PORT))
sock.close()
except Exception as e:
print("Send signalk error = ",e)
The ESP connection wifi function is a mess & won't reconnect if the Pi is down for a while so won't post that 😁
Been running fine for must be years now though constantly.
thank you
Port is missing