Hi All,
I am passing a JSON into two function nodes. The function nodes decode my msg.payload.payload_raw, by first changing it to 'Base64' and and then decode.
Decoder 1
let data = msg.payload.payload_raw;
let bytes = new Buffer(data,'Base64');
let decoded = context.Decoder(bytes, msg.payload.port);
msg.payload.uplink_message.decoded_payload = decoded;
return msg;
Decoder 2
let data = msg.payload.payload_raw;
let bytes = new Buffer(data,'Base64');
let decoded = context.Decoder(bytes, msg.payload.port);
msg.payload.decoded_payload = decoded;
return msg;
The only difference is that in Decoder 1 is "msg.payload.uplink_message.decoded_payload = decoded" and in Decoder 2 is "msg.payload.decoded_payload = decoded"
Function node Decoder 1 error
function : (error)
"TypeError: Cannot set property 'decoded_payload' of undefined"
Why is it doing this?
[{"id":"67c0cd0e.e13064","type":"function","z":"1f9de5c0.4c944a","name":"Decoder 1","func":"let data = msg.payload.payload_raw;\nlet bytes = new Buffer(data,'Base64');\n\nlet decoded = context.Decoder(bytes, msg.payload.port);\nmsg.payload.uplink_message.decoded_payload = decoded;\nreturn msg;","outputs":1,"noerr":0,"initialize":"context.Decoder = function(bytes, port) {\n // Decode an uplink message from a buffer\n // (array) of bytes to an object of fields.\n var decoded = {};\n\n if (port === 1)\n {\n decoded.type = \"position\";\n \n decoded.latitudeDeg = bytes[0] + bytes[1] * 256 + bytes[2] * 65536 + bytes[3] * 16777216;\n if (decoded.latitudeDeg >= 0x80000000)\n decoded.latitudeDeg -= 0x100000000;\n decoded.latitudeDeg /= 1e7;\n \n decoded.longitudeDeg = bytes[4] + bytes[5] * 256 + bytes[6] * 65536 + bytes[7] * 16777216;\n if (decoded.longitudeDeg >= 0x80000000)\n decoded.longitudeDeg -= 0x100000000;\n decoded.longitudeDeg /= 1e7;\n \n decoded.inTrip = ((bytes[8] & 0x1) !== 0) ? true : false;\n decoded.fixFailed = ((bytes[8] & 0x2) !== 0) ? true : false;\n decoded.headingDeg = (bytes[8] >> 2) * 5.625;\n \n decoded.speedKmph = bytes[9];\n decoded.batV = bytes[10] * 0.025;\n }\n else if (port === 2)\n {\n decoded.type = \"downlink ack\";\n \n decoded.sequence = (bytes[0] & 0x7F);\n decoded.accepted = ((bytes[0] & 0x80) !== 0) ? true : false;\n decoded.fwMaj = bytes[1];\n decoded.fwMin = bytes[2];\n }\n else if (port === 3)\n {\n decoded.type = \"stats\";\n \n decoded.initialBatV = (((bytes[0] & 0xF) !== 0) ? (4.0 + (bytes[0] & 0xF) * 0.100) : null);\n decoded.txCount = 32 * ((bytes[0] >> 4) + (bytes[1] & 0x7F) * 16);\n decoded.tripCount = 32 * ((bytes[1] >> 7) + (bytes[2] & 0xFF) * 2\n + (bytes[3] & 0x0F) * 512);\n decoded.gpsSuccesses = 32 * ((bytes[3] >> 4) + (bytes[4] & 0x3F) * 16);\n decoded.gpsFails = 32 * ((bytes[4] >> 6) + (bytes[5] & 0x3F) * 4);\n decoded.aveGpsFixS = 1 * ((bytes[5] >> 6) + (bytes[6] & 0x7F) * 4);\n decoded.aveGpsFailS = 1 * ((bytes[6] >> 7) + (bytes[7] & 0xFF) * 2);\n decoded.aveGpsFreshenS = 1 * ((bytes[7] >> 8) + (bytes[8] & 0xFF) * 1);\n decoded.wakeupsPerTrip = 1 * ((bytes[8] >> 8) + (bytes[9] & 0x7F) * 1);\n decoded.uptimeWeeks = 1 * ((bytes[9] >> 7) + (bytes[10] & 0xFF) * 2);\n }\n\n return decoded;\n}","finalize":"","libs":[],"x":370,"y":200,"wires":[["7aede05c.a9783"]]}]
[admin edit: fixed trailing ticks to backticks]
