Created
April 8, 2021 06:52
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simple javascript evaluator service (to test larger MTU)
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| maxlen=56; | |
| NRF.setServices({ | |
| 0x190A : { // Desay AT commands service ID (DS-D6, HX03W) | |
| 0x0002 : { | |
| maxLen: maxlen, | |
| notify: true | |
| }, | |
| 0x0001 : { | |
| writable : true, | |
| maxLen: maxlen, | |
| onWrite : function(evt) { | |
| handleWrite(evt,'0x190A','0x0002',maxlen); | |
| } | |
| } | |
| } | |
| },{uart:true}); // still enable console | |
| function handleWrite(evt, svc, ch, len){ | |
| //log(svc+" got "+evt.data); | |
| var val=handleCommand(E.toString(evt.data)); | |
| if (val===undefined || val===null) return; | |
| if (typeof(val)==="number") val=val.toString(); | |
| if (typeof(val)==="object") val=JSON.stringify(val); | |
| if (typeof(val)==="string") { | |
| //log("reply="+val); | |
| val=E.toArrayBuffer(val); | |
| } | |
| if (!val.length) return; | |
| // now update service with the value | |
| var c={}; | |
| var s={};s[svc]=c; | |
| c[ch]={value : val, notify: true}; | |
| if (val.length<=len) | |
| NRF.updateServices(s); | |
| else { | |
| // if longer than maxlen split into chunks | |
| var l=val.length; | |
| var i=0; | |
| while (l>0){ | |
| c[ch].value=new Uint8Array(val,i,(l>len)?len:l); | |
| NRF.updateServices(s); | |
| i+=len;l-=len; | |
| } | |
| } | |
| } | |
| var line=""; | |
| function handleCommand(s){ | |
| line+=s; | |
| if (s.endsWith("\n") || s.endsWith("\r")){ | |
| var res=handleLine(line.trim());//trim removes crlf | |
| line=""; | |
| return res; | |
| } | |
| } | |
| function handleLine(l){ | |
| try { | |
| res=eval(l); | |
| } catch(e){ | |
| res="Uncaught "+e.type+": "+e.message; | |
| } | |
| return res; | |
| } |
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