Send data from server to several pico w connected via uplink

Anvil Q&A
#1

Hi all,

Is it possible to use one common anvil uplink key on several pico w units and then by using a unique identifier (for example an email address) on each pico - let the anvil server module send a specific blinking pattern to the pico led based on a anvil table which contains email address and blinking pattern ?

Any help i can get on this “handshake” procedure will be greatly appreciated.

Regards
Christen

#2

When you connect to an uplink, the functions available are “registered” with the anvil server by name.

You can override this behavior by passing a new function string name into the @...callable() decorator, and this can be done programmatically.

So if you assigned each pico its own ID (or let it pick something of its own like a unique hardware identifier or an email address or hash of some personal info) then you can do something like:

## This is pico 1
UNIQUE_ID = "01"

@anvil.pico.callable_async(f"{ UNIQUE_ID }_blinky_func")
def blinky_func(color, duration):
    # This is pseudo code, 
    # you would make a function for this to work
    pico_blink(color, duration)

anvil.pico.connect("<ALL-THE-SAME-UPLINK-KEY>")


## This is pico 2
UNIQUE_ID = "02"

@anvil.pico.callable_async(f"{ UNIQUE_ID }_blinky_func")
def blinky_func(color, duration):
    # This is pseudo code, 
    # you would make a function for this to work
    pico_blink(color, duration)

anvil.pico.connect("<ALL-THE-SAME-UPLINK-KEY>")


## This is pico 3
UNIQUE_ID = "03"

@anvil.pico.callable_async(f"{ UNIQUE_ID }_blinky_func")
def blinky_func(color, duration):
    # This is pseudo code, 
    # you would make a function for this to work
    pico_blink(color, duration)

anvil.pico.connect("<ALL-THE-SAME-UPLINK-KEY>")


# in the anvil cloud server module

def july_fourth_blink():
   anvil.server.call("01_blinky_func", "red", 0.33)
   anvil.server.call("02_blinky_func", "white", 0.33)
   anvil.server.call("03_blinky_func", "blue", 0.33)

Then when you call july_fourth_blink() from the server module after running the uplink on all three picos correctly, you should get them to blink red, white, then blue within around a second of each other.

2 Likes
#3

Perfect - thanks a lot for your help. This is really appreciated. I will try this method and see if it works.

#4

Ignore me, I just reread your question :slight_smile:

Nurse?