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Forum Index : Microcontroller and PC projects : Using MMB4L but not an MMB4L problem

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lizby
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Joined: 17/05/2016
Location: United States
Posts: 3326

Posted: 12:56pm 17 Mar 2025

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On a Pi 5, I'm trying to use MMB4L to retrieve and process the "ENERGY" values for a Sonoff POW R3 16 which has been flashed with Tasmota.

If I run this from the linux command prompt:

curl http://192.168.1.31/cm?cmnd=Status%208

I get this json payload back:

{"StatusSNS":{"Time":"2025-03-17T08:42:25","ENERGY":{"TotalStartTime":"2025-01-14T15:09:38","Total":242.301,"Yesterday":2.520,"Today":0.030,"Power":5,"ApparentPower":10, "ReactivePower":9,"Factor":0.44,"Voltage":123,"Current":0.085}}}

With MMB4L I get a bunch of header information before the data payload.

MMBasic for Linux aarch64 v0.7-alpha.1
Copyright 2011-2025 Geoff Graham
Copyright 2016-2025 Peter Mather
Copyright 2021-2025 Thomas Hugo Williams

> dim m%(100)
> system "curl http://192.168.1.31/cm?cmnd=Status%208",m%()
> longstring print m%()
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 233 0 233 0 0 1093 0 --:--:-- --:--:-- --:--:-- 1093
{"StatusSNS":{"Time":"2025-03-17T08:42:25","ENERGY":{"TotalStartTime":"2025-01-14T15:09:38","Total":242.301,"Yesterday":2.520,"Today":0.030,"Power":5,"ApparentPower":10, "ReactivePower":9,"Factor":0.44,"Voltage":123,"Current":0.085}}}
>

I realize that the shell you get with MMB4L's "system" command may not be the same shell you have with the linux command prompt, and that is probably what is happening.

I do not see any obvious switch for curl to suppress the headers. Does anyone see how to get just the payload without further processing in MMB4L (e.g., INSTR to find "{" and then MID$ to extract the payload)?

~
Edited 2025-03-17 22:59 by lizby

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thwill

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Joined: 16/09/2019
Location: United Kingdom
Posts: 4252

Posted: 01:10pm 17 Mar 2025

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Try adding --no-progress-meter to the curl command within the SYSTEM call.

Best wishes,

Tom

MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures

lizby
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Joined: 17/05/2016
Location: United States
Posts: 3326

Posted: 01:20pm 17 Mar 2025

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Perfect. Thank you.

Asked and answered within 15 minutes. This forum cannot be beat.

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