8 years, 3 months ago.

Here is a copy of code I use in a function node to parse data from the EVB using the data structure defined in the EVB code. Just copy this code to a function node in Node Red and make sure your lora node is set to binary mode. /media/uploads/falingtrea/evbparser.txt

8 years, 3 months ago.

Patrick, Here's a complete Node Red flow with the following structure:

LoRa Input Node -> Function Node -> Debug Node

Note that the LoRa Input Node must have the Data Type field set to "Bytes" and the Debug Node should have the Output field set to "complete msg object."

[{"id":"cfde92a0.3e1d68","type":"lora in","name":"","datatype":"bytes","x":196,"y":222,"z":"d10bbe5.35418c","wires":[["6683447f.753ae4"]]},{"id":"6683447f.753ae4","type":"function","name":"","func":"var data_type = {\n\tnone : 0x00,\n\tled1 : 0x01,\n\tled2 : 0x02,\n\tlux_max : 0x03,\n\tlux_min : 0x04,\n\tlux_curr : 0x05,\n\tbaro_max : 0x06,\n\tbaro_min : 0x07,\n\tbaro_curr : 0x08,\n\ttemp_max : 0x09,\n\ttemp__min : 0x0A,\n\ttemp_curr : 0x0B,\n\taccel_max : 0x0C,\n\taccel_min : 0x0D,\n\taccel_curr : 0x0E,\n\tconfiguration : 0x0F,\n\tgpio_in : 0x10,\n\tgpio_out : 0x11,\n\tcurrent_max : 0x12,\n\tcurrent_min : 0x13,\n\tcurrent_curr : 0x14,\n\tgps_latitude : 0x15,\n\tgps_longitude : 0x16,\n\tgps_time : 0x17,\n\tgps_date : 0x18,\n\tgps_lock : 0x19,\n\tqos_up : 0x1A,\n\tqos_dwn : 0x1B,\n\trf_out : 0x1C,\n\tdata_mark : 0x1D,\n};\n\nvar data_struc = {\n\tdata_valid : 0,\n\tblock_start :0,\n\ttemperature : 0,\n\tx_pos : 0,\n\ty_pos : 0,\n\tz_pos : 0,\n\tbaro_pressure : 0,\n\tlux : 0,\n\tpkt_timer :0,\n\trf_pwr : 0,\n\tsf_val : 0,\n\tgateways : 0,\n\tmargin_up : 0,\n\trssi_dwn : 0,\n\tsnr_dwn :0 ,\n\tlat_deg : 0 ,\n\tlat_min : 0,\n\tlong_deg : 0,\n\tlong_min : 0,\n\tnum_sats : 0 ,\n\tgps_status : 0,\n};\n\ncontext.global.data_out = context.global.data_out || data_struc;\nvar pData = context.global.data_out;\n\nvar msg_pntr = 0;\nvar temp = 0;\n\nwhile (msg_pntr < msg.payload.length){\n\tswitch (msg.payload[msg_pntr]){\n\tcase data_type.lux_max:\n\tcase data_type.lux_min:\n\tcase data_type.lux_curr:\n\t\tpData.lux = msg.payload[++msg_pntr] << 8 \n\t\tpData.lux |= msg.payload[++msg_pntr];\n\t\tpData.lux = pData.lux * 0.24;\n\t\tmsg_pntr++;\n\t\tbreak;\n\tcase data_type.baro_max:\n\tcase data_type.baro_min:\n\tcase data_type.baro_curr:\n\t\tpData.baro_pressure = msg.payload[++msg_pntr]<<16;\n\t\tpData.baro_pressure |= msg.payload[++msg_pntr]<<8;\n\t\tpData.baro_pressure |= msg.payload[++msg_pntr];\n\t\tpData.baro_pressure = pData.baro_pressure * 0.25;\n\t\tmsg_pntr++;\n\t\tbreak;\n\tcase data_type.accel_max:\n\tcase data_type.accel_min:\n\tcase data_type.accel_curr:\n\t\tpData.x_pos = ((msg.payload[++msg_pntr] << 24) >> 24) * 0.0625;\n\t\tpData.y_pos = ((msg.payload[++msg_pntr] << 24) >> 24) * 0.0625;\n\t\tpData.z_pos = ((msg.payload[++msg_pntr] << 24) >> 24) * 0.0625;\n\t\tmsg_pntr++;\n\t\tbreak;\n\tcase data_type.temp_min:\n\tcase data_type.temp_max:\n\tcase data_type.temp_curr:\n\t\tpData.temperature = msg.payload[++msg_pntr] << 24;\n\t\tpData.temperature |= msg.payload[++msg_pntr] << 16;\n\t\tpData.temperature = (pData.temperature >> 16) * .0625;\n\t\tmsg_pntr++;\n\t\tbreak;\n\tcase data_type.configuration:\n\t\tpData.pkt_timer = msg.payload[++msg_pntr];\n\t\tmsg_pntr++\n\t\tbreak;\n\tcase data_type.current_max:\n\tcase data_type.current_min:\n\tcase data_type.current_curr:\n\t\tmsg_pntr++;\n\t\tmsg_pntr++;\n\t\tmsg_pntr++;\n\t\tbreak;\n\tcase data_type.gps_latitude:\n\t\tpData.lat_deg = (msg.payload[++msg_pntr] << 24) >> 24;\n\t\tpData.lat_min = msg.payload[++msg_pntr];\n\t\ttemp = msg.payload[++msg_pntr] << 8 \n\t\ttemp |= msg.payload[++msg_pntr];\n\t\tpData.lat_min = pData.lat_min + (temp * 0.0001);\n\t\tmsg_pntr++;\n\t\tbreak;\n\tcase data_type.gps_longitude:\n\t\tpData.long_deg = (msg.payload[++msg_pntr] << 24);\n\t\tpData.long_deg |= (msg.payload[++msg_pntr] << 16);\n\t\tpData.long_deg = pData.long_deg >> 16;\n\t\tpData.long_min = msg.payload[++msg_pntr];\n\t\ttemp = msg.payload[++msg_pntr] << 8 \n\t\ttemp |= msg.payload[++msg_pntr];\n\t\tpData.long_min = pData.long_min + (temp * 0.0001);\n\t\tmsg_pntr++;\n\t\tbreak;\n\tcase data_type.gps_time:\n\t\tmsg_pntr++;\n\t\tmsg_pntr++;\n\t\tmsg_pntr++;\n\t\tmsg_pntr++;\n\t\tbreak;\n\tcase data_type.gps_date:\n\t\tmsg_pntr++;\n\t\tmsg_pntr++;\n\t\tmsg_pntr++;\n\t\tmsg_pntr++;\n\t\tbreak;\n\tcase data_type.gps_lock:\n\t\tmsg_pntr++;\n\t\tpData.gps_status = msg.payload[msg_pntr] & 0x0F;\n\t\tpData.num_sats = msg.payload[msg_pntr++] >> 4;\n\t\tbreak;\n\tcase data_type.qos_up:\n\t\tpData.gateways = msg.payload[++msg_pntr] << 24;\n\t\tpData.gateways |= msg.payload[++msg_pntr] << 16;\n\t\tpData.gateways = pData.gateways >> 16;\n\t\tpData.margin_up = (msg.payload[++msg_pntr] << 24) >> 24;\n\t\tpData.rf_pwr = (msg.payload[++msg_pntr] << 24) >> 24;\n\t\tmsg_pntr++;\n\t\tbreak;\n\tcase data_type.qos_dwn:\n\t\tpData.rssi_dwn = msg.payload[++msg_pntr] << 24;\n\t\tpData.rssi_dwn |= msg.payload[++msg_pntr] << 16;\n\t\tpData.rssi_dwn = pData.rssi_dwn >> 16;\n\t\tpData.snr_dwn = ((msg.payload[++msg_pntr] << 24) >> 24);\n\t\tmsg_pntr++;\n\t\tbreak;\n\tcase data_type.rf_out:\n\t\tpData.rf_pwr = (msg.payload[++msg_pntr] << 24) >> 24;\n\t\tmsg_pntr++;\n\t\tbreak;\n\tcase data_type.data_mark:\n\t\tif (msg_pntr == 0) {\n\t\t\tpData = data_struc;\n\t\t\tpData.block_start = 1;\n\t\t\tmsg_pntr++;\n\t\t}\n\t\telse if (msg_pntr == (msg.payload.length - 1) && (pData.block_start === 1)) {\n\t\t\t\tpData.data_valid = 1;\n\t\t\t\tmsg_pntr++;\n\t\t\t}\n\t\t\telse {\n\t\t\t\tpData = data_struc;\n\t\t\t\tmsg_pntr = msg.payload.length;\n\t\t\t\t}\n\t\tbreak;\n\tdefault:\n\t\tpData = data_struc;\n\t\tmsg_pntr = msg.payload.length;\n\t}\n}\n\npData.sf_val = parseInt(msg.datr.replace(\"SF\",\"  \"),10);\n\ncontext.global.data_out = pData;\n\nreturn pData;","outputs":1,"x":429,"y":220,"z":"d10bbe5.35418c","wires":[["3c18f05c.5fa09"]]},{"id":"3c18f05c.5fa09","type":"debug","name":"","active":true,"console":"false","complete":"true","x":700,"y":220,"z":"d10bbe5.35418c","wires":[]}]

Hope this helps.

-Mike