Javascript programming

We are a Commercial Internet of Things installer based in Cornwall UK and need assistance with very small amounts of Javascript coding. The "payload" decoder below is what we already have: /* simple payload decoder. */ var TYPE_VDD = 0x07; //VDD 2byte 0-65535mV var TYPE_PULSE1 = 0x0A; //2bytes relative pulse count var TYPE_PULSE1_ABS = 0x0B; //4bytes no 0->0xFFFFFFFF var TYPE_EXT_TEMP1 = 0x0C; //2bytes -3276.5C-->3276.5C var TYPE_EXT_DIGITAL = 0x0D; //1bytes value 1 or 0 var TYPE_EXT_DISTANCE = 0x0E; //2bytes distance in mm var TYPE_EXT_DIGITAL2 = 0x1A; // 1bytes value 1 or 0 var TYPE_DEBUG = 0x3D; // 4bytes debug function bin16dec(bin) { var num=bin&0xFFFF; if (0x8000 & num) num = - (0x010000 - num); return num; } function bin8dec(bin) { var num=bin&0xFF; if (0x80 & num) num = - (0x0100 - num); return num; } function hexToBytes(hex) { for (var bytes = [], c = 0; c < [login to view URL]; c += 2) [login to view URL](parseInt([login to view URL](c, 2), 16)); return bytes; } function DecodePayload(data){ var obj = new Object(); for(i=0;i<[login to view URL];i++){ //[login to view URL](data[i]); switch(data[i]){ case TYPE_VDD: //Battery level obj.vdd=(data[i+1]<<8)|(data[i+2]); i+=2; break case TYPE_PULSE1: //Pulse input 1 var pulse1=(data[i+1]<<8)|(data[i+2]); var pulse1adjusted=pulse1*10; obj.pulse1=pulse1; obj.pulse1adjusted=pulse1adjusted; i+=2; break case TYPE_PULSE1_ABS: //Pulse input 1 absolute value var pulseAbs=(data[i+1]<<24)|(data[i+2]<<16)|(data[i+3]<<8)|(data[i+4]); obj.pulseAbs=pulseAbs; i+=4; break case TYPE_EXT_TEMP1: //External temp var temp=(data[i+1]<<8)|(data[i+2]); temp=bin16dec(temp); obj.externalTemperature=temp/10; i+=2; break case TYPE_EXT_DIGITAL: //Digital input obj.digital=(data[i+1]); i+=1; break case TYPE_EXT_DISTANCE: //Distance sensor input var distance1=(data[i+1]<<8)|(data[i+2]); obj.distance=distance1; i+=2; break case TYPE_EXT_DIGITAL2: //Digital input 2 obj.digital2=(data[i+1]); i+=1; break default: //somthing is wrong with data i=[login to view URL]; break } } return obj; } function Decoder(bytes, port) { if (bytes[0] === 0x3e) { return {}; } return DecodePayload(bytes); } The code above decodes a payload from one of our sensors. We need to ignore decoded values for " var distance1" above 4000 as these are errors. We can describe in more greater detail but essentially with the right person (with the experience and knowledge of Javascript) it may be an hours work! As we build our range of sensors and applications we will need increasing amounts of coding support