Espruino NPM and Nordic Thingy52

[espruino-discuss]

Posted at 2020-05-01 by bakon

Hey guys.

So I have the nordic thingy52 with espruino 1v98 since I can't flash newer versions due to locked bootloader.

Anyways, I wrote a small program to run on it to basically collect some sensor data and store them in typed arrays in the ram, and a small data extraction function based on some examples from espruino.

Everything actually works great, the problem I'm having is when using the espruino NPM package(https://www.npmjs.com/package/espruino).

Im using the example to run expresion function on the device.

import { GetSensorData } from "../generated-typings";
var esp = require("espruino");

const getSensorData: GetSensorData = (deviceID, sensorType) => {
  return Promise.resolve(querySensors(deviceID, sensorType));
};

const querySensors = (deviceID:any, sensorType: any):Promise<any> => {
  return new Promise((resolve, reject) => {  
    esp.init((data:any) => {
      esp.expr(deviceID, 'exportData('+sensorType+')', function(data:any){
        // resolve(JSON.parse(data));
        resolve(data);
        console.log("your data:" + data);
        // return(data);
      });
    });
  });
}

// queryPressure("e5:b6:7f:eb:a0:dd");
export default getSensorData;
});

And on first call it works great and returns data to my app, however when I do the same call again I get unable to connect error:

Already initialised.
Already initialised.
BT> Connecting
BT> Connected
Connected {}
BT> send "\n"
Received a prompt after sending newline... good!
Sending...
---> "\u0010print(\"<\",\"<<\",JSON.stringify(process.env),\">>\",\">\")\n"
BT> send "\u0010print(\"<\",\"<<\",JSON"
BT> send ".stringify(process.e"
BT> send "nv),\">>\",\">\")\n"
Sent
Receiving...
Got "< << {\"VERSION\":\"1v98\",\"GIT_COMMIT\":\"1e06400\",\"BOARD\":\"THINGY52\",\"FLASH\":524288,\"RAM\":65536,\"SERIAL\":\"50a977b6-bf9ebbea\",\"CONSOLE\":\"Bluetooth\",\"MODULES\":\"Flash,Storage,BH1745,Thingy,LPS22HB,HTS221,CCS811,MPU9250,LIS2DH12\",\"EXPTR\":536882356} >> >\r\n>"

Found THINGY52, 1v98
Loading http://www.espruino.com/json/THINGY52.json
Board JSON loaded
Firmware >1.43 supports faster writes over USB
Set Slow Write = false
FIRMWARE: Current 1v98, Available 2v05
BT> send "\n"
Received a prompt after sending newline... good!
Sending...
---> "\u0010print(\"<\",\"<<\",JSON.stringify(exportData(temp)),\">>\",\">\")\n"
BT> send "\u0010print(\"<\",\"<<\",JSON"
BT> send ".stringify(exportDat"
BT> send "a(temp)),\">>\",\">\")\n"
Sent
Receiving...
Got "< << [{\"date\":{\"ms\":1588436637},\"sensor\":\"22.31\"},{\"date\":{\"ms\":1588436641},\"sensor\":\"22.29\"},{\"date\":{\"ms\":1588436645},\"sensor\":\"22.23\"},{\"date\":{\"ms\":1588436649},\"sensor\":\"22.23\"},{\"date\":{\"ms\":1588436653},\"sensor\":\"22.16\"},{\"date\":{\"ms\":1588436657},\"sensor\":\"22.14\"},{\"date\":{\"ms\":1588436661},\"sensor\":\"22.18\"},{\"date\":{\"ms\":1588436665},\"sensor\":\"22.19\"},{\"date\":{\"ms\":1588436669},\"sensor\":\"22.16\"},{\"date\":{\"ms\":1588436673},\"sensor\":\"22.10\"},{\"date\":{\"ms\":1588436677},\"sensor\":\"22.16\"},{\"date\":{\"ms\":1588436681},\"sensor\":\"22.21\"},{\"date\":{\"ms\":1588436685},\"sensor\":\"22.21\"},{\"date\":{\"ms\":1588436689},\"sensor\":\"22.18\"},{\"date\":{\"ms\":1588436693},\"sensor\":\"22.14\"},{\"date\":{\"ms\":1588436697},\"sensor\":\"22.10\"},{\"date\":{\"ms\":1588436701},\"sensor\":\"22.27\"},{\"date\":{\"ms\":1588436705},\"sensor\":\"22.16\"},{\"date\":{\"ms\":1588436709},\"sensor\":\"22.27\"},{\"date\":{\"ms\":1588436713},\"sensor\":\"22.19\"},{\"date\":{\"ms\":1588436717},\"sensor\":\"22.27\"},{\"date\":{\"ms\":1588436721},\"sensor\":\"22.23\"},{\"date\":{\"ms\":1588436725},\"sensor\":\"22.29\"},{\"date\":{\"ms\":1588436729},\"sensor\":\"22.19\"},{\"date\":{\"ms\":1588436733},\"sensor\":\"22.05\"}] >> >\r\n>"


Unable to connect!
your data:undefined

And basically it does this until I stop and start the nodejs app again.

Thank you.

[espruino-discuss]

Posted at 2020-05-02 by bakon

Also this is the code running on my thingy device:
https://github.com/bakon11/openrpcThingy52/blob/master/server/typescript/src/devices/thingy52.js

I noticed that it actually does execute the function each time, but it disconnects before the call back fires off back to node JS and my data comes back undefined.

---

Posted at 2020-05-04 by @gfwilliams

Is the problem in this case just that you are calling init twice? You should only call init once, but after that multiple calls to expr should be fine.

---

Posted at 2020-05-05 by bakon

oh oops you're right, unfortunately that didn't solve my problem. I'm making a better post about it on the github commit.

Thank you.