Node-Red to Espruino

[espruino-discuss2]

Posted at 2015-01-30 by LawrenceG

I'm starting to develop a Node-Red [NR] node for use with the Espruino
Even with echo(0); as the last command in my JS I'm getting some Echo back from the interpreter. I'm wondering what I might be doing wrong as this isn't the behavior of the IDE?

In attached image 1. I'm calling a Espruino function from NR be sending "getAna(0);\n" The interpreter echos the function name, followed by the JSON I want back plus return val and Cursor > 2. Espruino calls a function is every min which prints the JSON I want again followed by the Cursor >.

I still want \n back from the interpreter but not function name called or cursor symbol.

Lawrence

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Attachments:

• NR-Espruino.png

[gfwilliams]

Posted at 2015-02-02 by @gfwilliams

It does look a lot like the echo(0); didn't get through the first time. Perhaps you could somehow dump the code you're sending to Espruino (eg connect 2x USB-TTL modules together, and then listen on one while using the other with Espruino?).

It should be something like:

echo(0);\n

console.log({my:1,json:2})\n
console.log({my:3,json:4})\n
console.log({my:5,json:6})\n

There could also be garbage in Espruino's input line when you connect, so you can try sending Ctrl-C (char code 0x03) before the echo(0) just in case?

[espruino-discuss2]

Posted at 2015-02-02 by LawrenceG

Thanks will try that, but sending crtl-c helps. I found node-red/node.js hates the espruino reset button being pressed takes 90% cpu & stays there! Have to ctrl-c node.js then press reset as ttyACM0 gets permission locked.

That said NR & espruino work so well together! I wish I started down this route a year ago, even evil eval works a treat "eval("function foo() { console.log('foo'); }");foo();save()\n"; then call foo().

Am planing an industrial IO board for the PICO.

Lawrence

[gfwilliams]

Posted at 2015-02-03 by @gfwilliams

Hi Lawrence,

Glad it's working now! Because Espruino executes the code directly, 'eval' actually works particularly well :)

I'd also added the ability to do an 'inline echo off'. If you send character code 16 on a blank line, and then your command, then you won't need to use echo(0). However having tried it just now it looks like there's still an issue with the trailing > character

An industrial IO board would be great! Hopefully I'll be releasing an Eagle CAD part outline for it in the next few weeks, which should help a lot!