Occasional parse errors?

[sortelma]

Neat project, thanks for releasing it! I've been trying to set it up for myself. It's working, but I noticed the display would stop updating occasionally. I turned on the serial console and saw alternately

adsb: JSON parse error: InvalidInput

or I think also sometimes IncompleteInput

I added a quick line to dump what the JSON it was getting Serial.printf("payload: %s\n", payload.c_str());. This is one of the example payloads. It seems like it's missing some data or something. I don't know if this is a problem with the source API or some problem with the read response code or what. (it's possible my debug code is bad too, but I think this should work)

{"ac":[
{"hex":"a8bab9","type":"adsb_icao","flight":"N6613H  ","r":"N6613H","t":"C172","desc":"CESSNA172 Skyhawk","ownOp":"6613 H LTD","year":"1975","alt_baro":4600,"alt_geom":4550,"gs":111.9,"track":208.86,"geom_rate":-128,"squawk":"2421","emergency":"none","category":"A1","lat":42.494512,"lon":-71.185530,"nic":9,"rc":75,"seen_pos":0.225,"version":2,"nic_baro":1,"nac_p":10,"nac_v":2,"sil":3,"sil_type":"perhour","gva":2,"sda":2,"alert":0,"spi":0,"mlat":[],"tisb":[],"messages":22148,"seen":0.0,"rssi":-17.2,"dst":5.872,"dir":317.5},
{"hex":"a4ddca","type":"adsb_icao","flight":"RPA4726 ","r":"N412YX","t":"E75L","desc":"EMBRAER ERJ-170-200 (long wing)","ownOp":"REPUBLIC AIRWAYS INC","year":"2013","alt_baro":8175,"alt_geom":8300,"gs":263.4,"track":66.74,"baro_rate":-832,"squawk":"6674","emergency":"none","category":"A3","nav_qnh":1012.8,"nav_altitude_mcp":6016,"nav_modes":["autopilot","tcas"],"lat":42.506522,"lon":-71.166432,"nic":8,"rc":186,"seen_pos":0.065,"version":2,"nic_baro":1,"nac_p":10,"nac_v":2,"sil":3,"sil_type":"perhour","gva":2,"sda":2,"alert":0,"spi":0,"mlat":[],"tisb":[],"messages":42016,"seen":0.1,"rssi":-9.8,"dst":5.939,"dir":328.2},
{"hex":"aa4e80","type":"adsb_icao","flight":"AAL1147 ","r":"N763US","t":"A319","desc":"AIRBUSA-319","ownOp":"UMB BANK NA TRUSTEE","year":"2000","alt_baro":"ground","gs":6.2,"true_heading":225.00,"squawk":"3417","emergency":"none","category":"A3","lat":42.362000,"lon":-71.023443,"nic":8,"rc":186,"seen_pos":3.541,"version":2,"nac_p":9,"nac_v":1,"sil":3,"sil_type":"perhour","sda":2,"mlat":[],"tisb":[],"messages":55910,"seen":3.5,"rssi":-16.2,"dst":4.843,"dir":138.5},
{"hex":"a210c5","type":"adsb_icao","flight":"RPA5666 ","r":"N232JQ","t":"E75L","desc":"EMBRAER ERJ-170-200 (long wing)","ownOp":"DELTA AIR LINES INC","year":"2008","alt_baro":"ground","gs":0.0,"true_heading":106.88,"squawk":"3527","emergency":"none","category":"A3","lat":42.365167,"lon":-71.023114,"nic":8,"rc":186,"seen_pos":40.322,"version":2,"nac_p":10,"nac_v":2,"sil":3,"sil_type":"perhour","sda":2,"alert":1,"spi":0,"mlat":[],"tisb":[],"messages":25,"seen":2.4,"rssi":-19.7,"dst":4.712,"dir":136.8},
{"hex":"a40639","type":"adsr_icao","r":"N35898","ownOp":"BOSTON LOGAN INTERNATIONAL AIRPORT","alt_baro":"ground","gs":11.2,"track":165.94,"category":"C2","lat":42.370789,"lon":-71.023069,"nic":0,"rc":0,"seen_pos":22.492,"sil_type":"perhour","mlat":[],"tisb":[],"messages":2679,"seen":22.5,"rssi":-19.3,"dst":4.472,"dir":133.9},
{"hex":"a24720","type":"adsb_icao","flight":"RPA5689 ","r":"N246JQ","t":"E75L","desc":"EMBRAER ERJ-170-200 (long wing)","ownOp":"DELTA AIR LINES INC","year":"2008","alt_baro":"ground","gs":0.0,"true_heading":300.94,"squawk":"3656","emergency":"none","category":"A3","lat":42.360977,"lon":-71.022252,"nic":8,"rc":186,"seen_pos":1.057,"version":2,"nac_p":10,"nac_v":2,"sil":3,"sil_type":"perhour","sda":2,"mlat":[],"tisb":[],"messages":28115,"seen":1.1,"rssi":-10.8,"dst":4.924,"dir":138.5},
{"hex":"a18a1c","type":"adsb_icao","flight":"FDX733  ","r":"N199FE","t":"B763","desc":"BOEING767-300","ownOp":"FEDERAL EXPRESS CORP","year":"2021","alt_baro":"ground","gs":0.0,"squawk":"2000","emergency":"none","category":"A5","lat":42.358887,"lon":-71.021555,"nic":8,"rc":186,"seen_pos":1.384,"version":2,"nac_p":10,"nac_v":1,"sil":3,"sil_type":"perhour","sda":2,"mlat":[],"tisb":[],"messages":62134,"seen":1.4,"rssi":-14.5,"dst":5.039,"dir":139.2},
{"hex":"a26b4a","type":"adsb_icao","flight":"ENY4047 ","r":"N255NN","t":"E75L","desc":"EMBRAER ERJ-170-200 (long wing)","ownOp":"AMERICAN AIRLINES INC","year":"2017","alt_baro":"ground","gs":0.0,"true_heading":123.75,"squawk":"1451","emergency":"none","category":"A3","lat":42.360249,"lon":-71.020572,"nic":8,"rc":186,"seen_pos":3.376,"version":2,"nac_p":10,"nac_v":2,"sil":3,"sil_type":"perhour","sda":2,"mlat":[],"tisb":[],"messages":70,"seen":3.4,"rssi":-18.4,"dst":5.006,"dir":138.2},
{"hex":"4b1885","type":"adsb_icao","flight":"SWR52   ","r":"HB-JHL","t":"A333","desc":"AIRBUSA-330-300","alt_baro":450,"alt_geom":375,"gs":145.8,"track":20.05,"baro_rate":-640,"squawk":"0770","emergency":"none","category":"A5","nav_qnh":1012.0,"nav_altitude_mcp":3008,"nav_heading":0.00,"lat":42.335164,"lon":-71.019457,"nic":8,"rc":186,"seen_pos":0.411,"version":2,"nic_baro":1,"nac_p":9,"nac_v":1,"sil":3,"sil_type":"perhour","gva":2,"sda":2,"alert":0,"spi":0,"mlat":[],"tisb":[],"messages":32581,"seen":0.0,"rssi":-16.6,"dst":6.241,"dir":147.1},
{"hex":"a00d5b","type":"adsb_icao","flight":"AAL3138 ","r":"N102NN","t":"A321","desc":"AIRBUSA-321","ownOp":"UMB BANK NA TRUSTEE","year":"2013","alt_baro":"ground","gs":0.0,"true_heading":11.25,"squawk":"1077","emergency":"none","category":"A3","lat":42.359962,"lon":-71.017888,"nic":8,"rc":186,"seen_pos":4.058,"version":2,"nac_p":9,"nac_v":1,"sil":3,"sil_type":"perhour","sda":2,"mlat":[],"tisb":[],"messages":115370,"seen":0.6,"rssi":-17.8,"dst":5.099,"dir":137.3},
{"hex":"4850e6","type":"adsb_icao","flight":"KLM618  ","r":"PH-AKF","t":"A333","desc":"AIRBUSA-330-300","alt_baro":"ground","gs":4.8,"true_heading":312.19,"squawk":"3513","emergency":"none","category":"A5","lat":42.370881,"lon":-71.016743,"nic":8,"rc":186,"seen_pos":2.553,"version":2,"nac_p":9,"nac_v":1,"sil":3,"sil_type":"perhour","sda":3,"mlat":[],"tisb":[],"messages":79,"seen":2.6,"rssi":-18.2,"dst":4.674,"dir":131.4},
{"hex":"a1cb05","type":"adsb_icao","flight":"JBU1387 ","r":"N2142J","t":"A21N","desc":"AIRBUSA-321neo","ownOp":"JETBLUE AIRWAYS CORP","alt_baro":"ground","gs":0.0,"true_heading":185.62,"squawk":"2417","emergency":"none","category":"A3","lat":42.368774,"lon":-71.015561,"nic":8,"rc":186,"seen_pos":1.384,"version":2,"nac_p":10,"nac_v":2,"sil":3,"sil_type":"perhour","sda":2,"mlat":[],"tisb":[],"messages":263908,"seen":0.3,"rssi":-22.6,"dst":4.797,"dir":132.1},
{"hex":"a1bc92","type":"adsb_icao","flight":"JBU777  ","r":"N2105J","t":"A21N","desc":"AIRBUSA-321neo","ownOp":"JETBLUE AIRWAYS CORP","year":"2021","alt_baro":"ground","gs":0.0,"true_heading":247.50,"squawk":"2000","emergency":"none","category":"A3","lat":42.368355,"lon":-71.014795,"nic":8,"rc":186,"seen_pos":3.900,"version":2,"nac_p":10,"nac_v":2,"sil":3,"sil_type":"perhour","sda":2,"mlat":[],"tisb":[],"messages":246136,"seen":3.9,"rssi":-22.4,"dst":4.839,"dir":132.1},
{"hex":"a72b6b","type":"adsb_icao","flight":"JBU270  ","r":"N561JB","t":"A320","desc":"AIRBUSA-320","ownOp":"BANK OF UTAH TRUSTEE","year":"2003","alt_baro":"ground","gs":0.0,"true_heading":315.00,"squawk":"5704","emergency":"none","category":"A3","lat":42.369221,"lon":-71.014439,"nic":8,"rc":186,"seen_pos":6.901,"version":2,"nac_p":10,"nac_v":2,"sil":3,"sil_type":"perhour","sda":2,"alert":0,"spi":0,"mlat":[],"tisb":[],"messages":63139,"seen":3.2,"rssi":-22.6,"dst":4.816,"dir":131.5},
{"hex":"a1dfeb","type":"adsb_icao","flight":"CST797  ","r":"N22NY","t":"PC12","desc":"PILATUSPC-12","ownOp":"ST JOHN AVIATION LLC","year":"2010","alt_baro":"ground","gs":22.5,"true_heading":135.00,"squawk":"5307","emergency":"none","category":"A1","lat":42.369278,"lon":-71.013284,"nic":8,"rc":186,"seen_pos":0.024,"version":2,"nac_p":10,"nac_v":2,"sil":3,"sil_type":"perhour","sda":2,"mlat":[],"tisb":[],"messages":199,"seen":0.0,"rssi":-21.1,"dst":4.852,"dir":131.1},{"hex":"ab1d06","type":"adsb_icao","flight":"RPA5679 ","r":"N815MD","t":"E170","desc":"EMBRAER ERJ-170-100","ownOp":"UMB BANK NA TRUSTEE","year":"2004","alt_baro":"ground","gs":4.8,"true_heading":194.06,"category":"A3","lat":186,"seen_pos":0.024,"version":2,"nac_p":10,"nac_v":2,"sil":3,"sil_type":"perhour","sda":2,"alert":0,"spi":0,"mlat":[],"tisb":[],"messages":14822,"seen":0.0,"rssi":-17.0,"dst":4.841,"dir":130.3},
{"hex":"a3a222"seen_pos":0.184,"version":2,"nic_baro":1,"nac_p":10,"nac_v":1,"sil":3,"sil_type":"perhour","gva":2,"sda":2,"alert":0,"spi":0,"mlat":[],"tisb":[],"messages":113742,"seen":0.0,"rssi":-13.8,"dst":5.182,"dir":127.9},
{"hex":"ad99fc","type":"adsb_icao","flight":"AAL1048 ","r":"N976AN","t":"B738","desc":"BOEING737-800","ownOp":"UMB BANK N A TRUSTEE","year":"2001","alt_baro":6675,"alt_geom":6775,"gs":255.8,"track":153.03,"baro_rate":-448,"squawk":"4072","emergency":"none","category":"A3","nav_qnh":1012.0,"nav_altitude_mcp":6016,"nav_heading":113.91,"lat":42.388699,"lon":-70.986307,"nic":8,"rc":186,"seen_pos":0.450,"version":2,"nic_baro":1,"nac_p":9,"nac_v":1,"sil":3,"sil_type":"perhour","gva":2,"sda":2,"alert":0,"spi":0,"mlat":[],"tisb":[],"messages":73949,"seen":0.3,"rssi":-17.1,"dst":5.251,"dir":112.6}
]
,"msg": "No error"
,"now": 1782087952001
,"total": 21
,"ctime": 1782087952001
,"ptime": 0
}

[sortelma]

Oh I should mention I'm within 5-6mi of boston logan, so it's possible there's a lot of data, particularly with ground planes.

[rsoennic]

Try it in a place with a really strong Wi-Fi signal and see if those errors don’t go away

[sortelma]

My access point is only a few feet away. I guess I can try on a battery bank instead of laptop in case of interference, though then I can't see logs. I do think the print code may be wrong since it doesn't always print when I was trying to print a "good" payload. I do know it's often between 9,000 and 12,000 in length. I'll try to debug some more tomorrow.

[rsoennic]

I see the same errors when I am set to the 9 or 16 mile radius and centered on a busy area. Guessing that the ADSB load is too large at that point. I tried increasing kMaxAircraft in adsb_client.h but it didn't help.

[aaugusty]

Having the same issue here; I'm close to two very large airports.

[SjDost]

Also see the same issue that the system display sometimes freezes. A hard reset immediately solves the issue. I am close to Amsterdam airport. Wifi signal is very strong. I am using the TENSTAR ESP32-C3-Zero.

[bengalaviz]

It looks like the issue is that when reading the json response. The data was getting corrupted when saving to a single String object. It can cause the json object to fail parsing. The ArduinoJson library can parse directly from the HTTP stream. Doing it this way, we can read the data on the fly and only keep the values needed. I've update the code for adsb_client.cpp (With help from chat) and it looks to be more stable.