Serial read bad checksum, Bad receive packet

[ballle98]

AqualinkD/aq_serial.c

Line 561 in 8657b39

logMessage(LOG_WARNING, "Serial read bad checksum, ignoring\n");

Currently seeing 6-7 bad checksum errors per day

• Does adding ground wire reduce rate of checksum errors?
• Add historical PM counter files in /var to better keep track (monthly folder, day of month file)
• reads are byte by byte add inter message timeout that is ~50ms (number to be validated). The checksum errors seem to be the result of a partial message prepended on next valid message.

pi@raspberrypi:~ $ journalctl _PID=9384 | cat
-- Logs begin at Fri 2019-09-06 15:35:06 CDT, end at Wed 2019-09-11 10:08:01 CDT. --
Sep 08 11:30:01 raspberrypi CRON[9384]: pam_unix(cron:session): session opened for user root by (uid=0)
Sep 08 11:30:01 raspberrypi CRON[9384]: pam_unix(cron:session): session closed for user root
Sep 10 06:01:20 raspberrypi aqualinkd[9384]: Starting web server on port 80
Sep 10 06:01:20 raspberrypi aqualinkd[9384]: Starting MQTT client to (null)
Sep 10 06:01:20 raspberrypi aqualinkd[9384]: Listening to Aqualink RS8 on serial port: /dev/ttyUSB0
Sep 10 06:01:20 raspberrypi aqualinkd[9384]: AqualinkD is using PDA mode
Sep 10 07:19:15 raspberrypi aqualinkd[9384]: Serial read bad checksum, ignoring
Sep 10 07:19:15 raspberrypi aqualinkd[9384]: Bad receive packet  |    Jandy | HEX: 0x10|0x02|0x62|0x04|0xf1|0xb5|0x9f|0xac|0x0b|0x12|0x92|0x1c|0xa2|0xe0|0x10|0x02|0x62|0x04|0x01|0x20|0x50|0x44|0x41|0x2d|0x50|0x53|0x34|0x20|0x43|0x6f|0x6d|0x62|0x6f|0x20|0x20|0xc2|0x10|0x03|
Sep 10 07:22:48 raspberrypi aqualinkd[9384]: Serial read bad checksum, ignoring
Sep 10 07:22:48 raspberrypi aqualinkd[9384]: Bad receive packet  |    Jandy | HEX: 0x10|0x02|0x62|0x04|0x08|0x45|0xfc|0x20|0x4f|0x46|0x46|0x6d|0x10|0x03|
Sep 10 13:00:19 raspberrypi aqualinkd[9384]: Serial read bad checksum, ignoring
Sep 10 13:00:19 raspberrypi aqualinkd[9384]: Bad receive packet  |    Jandy | HEX: 0x10|0x02|0x62|0x1b|0x00|0x00|0x8f|0x10|0xe3|0x10|0x02|0x62|0x1b|0x00|0x00|0x8f|0x10|0x03|
Sep 10 20:04:38 raspberrypi aqualinkd[9384]: Serial read bad checksum, ignoring
Sep 10 20:04:38 raspberrypi aqualinkd[9384]: Bad receive packet  |    Jandy | HEX: 0x10|0x02|0x62|0x09|0x64|0x5f|0x40|0x10|0x83|0x10|0x02|0x62|0x04|0x01|0x20|0x50|0x44|0x41|0x2d|0x50|0x53|0x34|0x20|0x43|0x6f|0x6d|0x62|0x6f|0x20|0x20|0xc2|0x10|0x03|
Sep 10 20:55:02 raspberrypi aqualinkd[9384]: Serial read bad checksum, ignoring
Sep 10 20:55:02 raspberrypi aqualinkd[9384]: Bad receive packet  |    Jandy | HEX: 0x10|0x02|0x62|0x04|0xf9|0x02|0x1e|0x24|0x24|0x48|0x48|0x5d|0x88|0xe0|0x10|0x02|0x62|0x04|0x09|0x41|0x4c|0x4c|0x20|0x4f|0x46|0x46|0x20|0x20|0x20|0x20|0x20|0x20|0x20|0x20|0x20|0x75|0x10|0x03|
Sep 10 23:43:27 raspberrypi aqualinkd[9384]: Serial read bad checksum, ignoring
Sep 10 23:43:27 raspberrypi aqualinkd[9384]: Bad receive packet  |    Jandy | HEX: 0x10|0x02|0x62|0x04|0x01|0x46|0x49|0xec|0xca|0x94|0x14|0x83|0x34|0xfc|0x10|0x02|0x62|0x04|0x01|0x46|0x49|0x4c|0x54|0x45|0x52|0x20|0x50|0x55|0x4d|0x50|0x20|0x20|0x4f|0x46|0x46|0xbc|0x10|0x03|
Sep 11 04:25:41 raspberrypi aqualinkd[9384]: Serial read bad checksum, ignoring
Sep 11 04:25:41 raspberrypi aqualinkd[9384]: Bad receive packet  |    Jandy | HEX: 0x10|0x02|0x62|0xfb|0x10|0x02|0x62|0x1b|0x00|0x00|0x8f|0x10|0x03|
Sep 11 07:44:34 raspberrypi aqualinkd[9384]: Serial read bad checksum, ignoring
Sep 11 07:44:34 raspberrypi aqualinkd[9384]: Bad receive packet  |    Jandy | HEX: 0x10|0x02|0xfa|0x55|0x53|0xa8|0x90|0x20|0x20|0x4f|0x4e|0x9e|0x10|0x03|
Sep 11 09:44:28 raspberrypi aqualinkd[9384]: Serial read bad checksum, ignoring
Sep 11 09:44:28 raspberrypi aqualinkd[9384]: Bad receive packet  |    Jandy | HEX: 0x10|0x02|0x62|0x1b|0x00|0xc0|0x10|0x02|0x62|0x1b|0x00|0x00|0x8f|0x10|0x03|
pi@raspberrypi:~ $