SMA.ino with a SMA inverter - getting error e4 for each register read

[planB-dev]

Hey Bert,

First, thank you so much for this project! This is exactly what I was trying to achieve. I'm running exactly this same setup as you ESP32 board + SMA inverter on a LAN.

I have succes to access the registers of the SunnyBoy SMA inverter manually from a PC-based modbus client on the same LAN, but I systematically get errors while using SMA.ino.

• It successfully connects to my SSID and LAN.
• It tries to read registers, and gets error E4
• it then crashes and reboot:

---

Connecting to WiFi... WiFi connected. IP: 192.168.10.151 reading registers Error packet 1: e4 Error packet 2: e4 Error packet 3: e4 Error packet 4: e4 Error packet 5: e0 Error packet 6: e0 Guru Meditation Error: Core 0 panic'ed (LoadProhibited). Exception was unhandled. Core 0 register dump: PC : 0x4013b7ab PS : 0x00060f30 A0 : 0x800d2c84 A1 : 0x3ffcf5d0
A2 : 0x3ffcf5f8 A3 : 0x0000000c A4 : 0x0000000c A5 : 0x00000000

---

I tries to change and explore a few different register addresses with the same result. But they all work ok with a PC-client.

Have you ever experienced this?

Thanks Again, Pascal

[bertmelis]

I'm sure I have had this error. Could you capture the rest of the dump? (and do a stack trace decode?) The crash is probably related to an invalid pointer.

Do the errors come immediately or only after some time (seconds).

Unfortunately, I don't have any modbus devices anymore so I cannot test. (unless I setup a simulator but it seems like a chore and I'm postponing it untill eternity, sorry)

[planB-dev]

Hi Bert,

thanks for the quick feedback!

Here is the complete stack dump:

---

_Connecting to WiFi... WiFi connected. IP: 192.168.10.184 reading registers Error packet 1: e4 Error packet 2: e4 Error packet 3: e4 Error packet 4: e4 Error packet 5: e4 Error packet 6: e4 Guru Meditation Error: Core 0 panic'ed (LoadProhibited). Exception was unhandled. Core 0 register dump: PC : 0x4013b7ab PS : 0x00060030 A0 : 0x800d2c84 A1 : 0x3ffcff00
A2 : 0x3ffcff28 A3 : 0x0000000c A4 : 0x0000000c A5 : 0x00000000
A6 : 0x00000001 A7 : 0x3ffb1f90 A8 : 0x00000000 A9 : 0x3ffcfec0
A10 : 0x00000000 A11 : 0x3ffcfeec A12 : 0x00000001 A13 : 0x00000001
A14 : 0x00060920 A15 : 0x00000000 SAR : 0x0000000a EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000000 LBEG : 0x4000c46c LEND : 0x4000c477 LCOUNT : 0xffffffff

Backtrace: 0x4013b7ab:0x3ffcff00 0x400d2c81:0x3ffcff20 0x4013b8c5:0x3ffcff60 0x400d3469:0x3ffcff80 0x400d34c1:0x3ffcffc0 0x400d391e:0x3ffcffe0 0x400883d1:0x3ffd0010

Rebooting... ets Jun 8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASHBOOT)

---

I'm having trouble to getting the stack decoder tool to work.

The errors happens after each of the 6 register reading (as per trace). It's an immediate problem.

I tried connecting to the Inverter with PC or android-based client as a control test, it works.

If you have any idea of what causes error "4", let me know. I would have thought it might be a modbus-TCP protocol variant issue, but since your code was written and tested on the same SMA inverter family, I doubt this is it.

Thanks.

[ReneHezser]

Is there an update to the problem? I am receiving the same error :-(

[alfmalo000]

Try to reboot the sunny boy o reboot the TCP and UDP modbus on configuration sunny boy.

[bertmelis]

I'm sorry to have you guys waiting. But now I'm stuck at home I'll try to find some time to look into this entire lib (in between supporting home school).

[fprumbau]

Having the same error, I decoded the stacktrace from above as

PC: 0x4013b7ab: esp_ota_get_running_partition at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/app_update/esp_ota_ops.c line 510 EXCVADDR: 0x00000000

Decoding stack results 0x4013b7ab: esp_ota_get_running_partition at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/app_update/esp_ota_ops.c line 510 0x400d2c81: AsyncClient::_close() at /home/fprumbau/Arduino/libraries/AsyncTCP/src/AsyncTCP.cpp line 815 0x4013b8c5: esp32ModbusTCPInternals::ModbusResponse::getSlaveAddress() at /tmp/arduino_build_997696/sketch/ModbusMessage.cpp line 202 0x400d3469: HardwareSerial::end() at /home/fprumbau/.arduino15/packages/esp32/hardware/esp32/1.0.4/cores/esp32/HardwareSerial.cpp line 88 0x400d34c1: HardwareSerial::begin(unsigned long, unsigned int, signed char, signed char, bool, unsigned long) at /home/fprumbau/.arduino15/packages/esp32/hardware/esp32/1.0.4/cores/esp32/HardwareSerial.cpp line 50 0x400d391e: String::changeBuffer(unsigned int) at /home/fprumbau/.arduino15/packages/esp32/hardware/esp32/1.0.4/cores/esp32/WString.cpp line 179 0x400883d1: prvInitialiseNewQueue at /home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/queue.c line 430

[bertmelis]

Could you try again with the v1 branch?

[fprumbau]

Wow, thank you for looking into this that quickly :-)

With v1 branch the crashes have gone for me.

It does read some values now, so it is working in principle!

Connecting to WiFi... WiFi lost connection. Reason: 202 WiFi connected. IP: 192.168.178.52 reading registers: requested status requested connectionstatus requested totalpower requested currentpower requested currentdc1power requested currentdc2power status: 307 connectionstatus: 51 reading registers: requested status requested connectionstatus requested totalpower requested currentpower requested currentdc1power requested currentdc2power status: 307 connectionstatus: 51 reading registers: requested status requested connectionstatus requested totalpower requested currentpower requested currentdc1power requested currentdc2power status: 307 connectionstatus: 51 reading registers: requested status requested connectionstatus requested totalpower requested currentpower requested currentdc1power requested currentdc2power status: 307 connectionstatus: 51 reading registers: requested status requested connectionstatus requested totalpower requested currentpower requested currentdc1power requested currentdc2power status: 307 connectionstatus: 51 reading registers: requested status requested connectionstatus requested totalpower requested currentpower requested currentdc1power requested currentdc2power status: 307 connectionstatus: 51 currentdc1power: 551 reading registers: requested status requested connectionstatus requested totalpower requested currentpower requested currentdc1power requested currentdc2power status: 307 connectionstatus: 51 currentdc2power: 91 reading registers: requested status requested connectionstatus requested totalpower requested currentpower requested currentdc1power requested currentdc2power status: 307 connectionstatus: 51

[fprumbau]

Maybe it's some timing issue. I modified the registers to only three entries. I am always getting 2 values. For me, that's OK (because the 3rd could be calculated).

_reading registers: requested currentpower, requested currentdc2power, requested currentdc1power, currentpower: 1512 currentdc2power: 120

reading registers: requested currentpower, requested currentdc2power, requested currentdc1power, currentpower: 1528 currentdc2power: 121

reading registers: requested currentpower, requested currentdc2power, requested currentdc1power, currentpower: 1568 currentdc2power: 121

reading registers: requested currentpower, requested currentdc2power, requested currentdc1power, currentpower: 1638 currentdc2power: 121

reading registers: requested currentpower, requested currentdc2power, requested currentdc1power, currentpower: 2206 currentdc2power: 123 _

[bertmelis]

The v1 version sends all requests without waiting for the previous to complete. It could be the SMA is not capable of handling all the requests. I (temporarily) moved so I cannot test myself anymore.

A workaround could be to only send your next request when the previous completes. Do this by raising a flag and request outside of the callback. (my computer is occupied by home schooling kids, I can't check code for race issues or deadlocks)