Not sending, waiting for other controller or unit to send first

[NFXUS007]

Background Info:

• Wired Controller: PREMTA000 [MASTER]
• Indoor Unit: B55AWYU3G5A
• Outdoor Unit: ABUW55G7SD0
• Almost identical AC as Not an issue - TEsted working with LG Ducted #30
• ESP Hardware: Unexpected Maker FeatherS3 [SLAVE]
• Other Hardware/Software: ThinkQ and a LG Wifi Module connected to the indoor unit

I'm having trouble with the ESP not being able to send or receive any data to my AC. I can control my AC via the wired controller and ThinkQ, but I cannot control it with the ESP32. The .yaml code is definitely set for the FeatherS3 to be set in SLAVE and the wired controller is confirmed to be in MASTER mode.

When setting the climate, the logs seems fine and fully connected to the FeatherS3:
[20:50:43.310][S][climate]: '' >>
[20:50:43.310][S][climate]: Mode: COOL
[20:50:43.310][S][climate]: Fan Mode: ON
[20:50:43.310][S][climate]: Target Temperature: 22.00°C

However, I'm getting the following continuous logs without any data actually being sent through to the AC:
[20:50:48.800][D][lg-controller:1360]: update
[20:50:48.805][D][lg-controller:1436]: Not sending, waiting for other controller or unit to send first
[20:50:54.799][D][lg-controller:1360]: update
[20:50:54.800][D][lg-controller:1436]: Not sending, waiting for other controller or unit to send first
[20:51:00.800][D][lg-controller:1360]: update
[20:51:00.807][D][lg-controller:1436]: Not sending, waiting for other controller or unit to send first
[20:51:06.800][D][lg-controller:1360]: update
[20:51:06.959][D][lg-controller:1436]: Not sending, waiting for other controller or unit to send first
[20:51:12.801][D][lg-controller:1360]: update
[20:51:12.801][D][lg-controller:1436]: Not sending, waiting for other controller or unit to send first
[20:51:18.799][D][lg-controller:1360]: update
[20:51:18.804][D][lg-controller:1436]: Not sending, waiting for other controller or unit to send first
[20:51:24.799][D][lg-controller:1360]: update
[20:51:24.799][D][lg-controller:1436]: Not sending, waiting for other controller or unit to send first
[20:51:30.799][D][lg-controller:1360]: update
[20:51:30.803][D][lg-controller:1436]: Not sending, waiting for other controller or unit to send first
[20:51:33.597][D][preferences:136]: Writing 1 items: 0 cached, 1 written, 0 failed

The PCB/ESP32 is connected directly to the wired wall controller with a pigtail wires to the GND/+12V/SIG-B. Similarly to #86

The transceiver on the FeatherS3 PCB is as per the BOM (TJA1027), however the the README under PCB details that originally the design used a TLIN1027. Could this be a contributing factor to the transceiver not correctly sending/receiving data?

I'm hoping someone is able to assist, has seen this issue, was able to resolve it or how to even diagnose this to find the root cause. I have already gone down this far into the project and would be keen to finish it in a working manner. I previously had a voltage issue on the PCB, but this was resolved (#156).

Please let me know what other info is needed.

[NFXUS007]

@JanM321 @cure any thoughts on the above?

I have an oscilloscope coming in the mail to check the TX/RX/LINBUS to make sure I'm getting signals. But this will be steep learning curve for me trying to work out what I'll be looking at.

[JanM321]

Probably best to try with just the ESP32 connected to the AC and then set it as master. Then when that works you can add the other controller back. Make sure you changed base.yaml for the FeatherS3 as explained in the readme.

[NFXUS007]

I removed the original wall controller and connected the FeatherS3 as master as per your recommendation, but I'm still not getting any change in temperature or fan speed. Here is my most recent log:

---

[12:39:14.066][C][mdns:194]:   Hostname: lgairconditionerpremta000
[12:39:14.067][C][homeassistant.sensor:017]: Homeassistant Sensor 'temp_sensor'
[12:39:14.067][C][homeassistant.sensor:017]:   State Class: ''
[12:39:14.067][C][homeassistant.sensor:017]:   Unit of Measurement: ''
[12:39:14.067][C][homeassistant.sensor:017]:   Accuracy Decimals: 1
[12:39:14.071][C][homeassistant.sensor:030]:   Entity ID: 'sensor.invalid'
[12:39:16.921][D][lg-controller:1360]: update
[12:39:22.923][D][lg-controller:1360]: update
[12:39:25.134][S][climate]: '' >>
[12:39:25.134][S][climate]:   Mode: HEAT
[12:39:25.134][S][climate]:   Fan Mode: MEDIUM
[12:39:25.134][S][climate]:   Target Temperature: 21.00°C
[12:39:28.922][D][lg-controller:1360]: update
[12:39:29.431][D][lg-controller:857]: sending A8.33.00.00.00.00.06.14.40.00.80.00.E0 (13)
[12:39:34.927][D][lg-controller:1360]: update
[12:39:35.432][E][lg-controller:880]: Unexpected missing previous CA/AA message
[12:39:35.438][D][preferences:152]: Writing 1 items: 0 cached, 1 written, 0 failed
[12:39:37.389][D][wifi:2410]: Roam check skipped, signal good (-26 dBm, attempt 1/3)
[12:39:40.924][D][lg-controller:1360]: update
[12:39:46.928][D][lg-controller:1360]: update
[12:39:52.926][D][lg-controller:1360]: update
[12:39:53.435][D][lg-controller:857]: sending A8.32.00.00.00.00.06.14.40.00.80.00.E1 (13)
[12:39:58.928][D][lg-controller:1360]: update
[12:40:04.929][D][lg-controller:1360]: update
[12:40:10.929][D][lg-controller:1360]: update
[12:40:16.936][D][lg-controller:1360]: update
[12:40:17.443][D][lg-controller:857]: sending A8.32.00.00.00.00.06.14.40.00.80.00.E1 (13)
[12:40:19.507][S][climate]: '' >>
[12:40:19.507][S][climate]:   Mode: HEAT
[12:40:19.507][S][climate]:   Fan Mode: HIGH
[12:40:19.507][S][climate]:   Target Temperature: 21.00°C
[12:40:22.932][D][lg-controller:1360]: update
[12:40:23.441][D][lg-controller:857]: sending A8.53.00.00.00.00.06.14.40.00.80.00.80 (13)
[12:40:28.935][D][lg-controller:1360]: update
[12:40:29.445][E][lg-controller:880]: Unexpected missing previous CA/AA message
[12:40:34.943][D][lg-controller:1360]: update
[12:40:35.438][D][preferences:152]: Writing 1 items: 0 cached, 1 written, 0 failed
[12:40:40.943][D][lg-controller:1360]: update
[12:40:46.940][D][lg-controller:1360]: update
[12:40:47.455][D][lg-controller:857]: sending A8.52.00.00.00.00.06.14.40.00.80.00.81 (13)
[12:40:52.948][D][lg-controller:1360]: update
[12:40:58.945][D][lg-controller:1360]: update

---

Here is my code for the Master operation:

---

substitutions:
  deviceid: "lgairconditionerpremta000" 
  devicename: "LG Air Conditioner - PREMTA000" 
  temperature_sensor_entity_id: sensor.invalid 
  fahrenheit: "false" 
  is_slave_controller: "false"

---

Regarding the temperature sensor entity, would this be the correct was to ignore a temperature sensor? I don't have a temperature sensor current connected to Home Assistant, and was relying on the wired wall controller for now. Since I have removed the wall controller, can the FeatherS3 still operate without a temp sensor [Albeit poorly or inefficiently]? Or could this be the reason for the 'Unexpected missing previous CA/AA message' error?

With the FeatherS32 code, the Github repository has them separated as base.yaml and template.yaml. However I have combined them into a single lg-controller.yaml. Just confirming that this is not an issue? or should I be separating them as base.yaml and template.yaml?

I have just received some TLIN1027 transceivers and am going to attempt to replace the TJA1027 transceiver if I have time this weekend. I'm still waiting for my oscilloscope to arrive.

[NFXUS007]

I should probably provide a progress update on this issue.

With the original TJA1027 transceiver, the featherS3 was sending signals on the TX line, but there was no transmission on the LINBUS of the PCB as shown on my oscilloscope. This is the reason my AC would not respond to any commands, whether in slave or master mode.

I replaced the TJA1027 with a TLIN1027 with some very poorly soldered joints (Buck converter was over heating up very quickly). With the TLIN1027, both TX and LINBUS were showing the same signal (at different voltages of course). After the successful experiment, I ordered another batch of the PCBs for the featherS3, but with the TLIN1027 instead.

This had successfully resolved the issues I was having. However, after a day of operation, I had some checksum errors. So I did a minor change to the code to the UART section with:
rx_buffer_size: 512
rx_timeout: 10

It's been operating now successfully for a few weeks with may wall controller in Master, the featherS3 in Slave and the LG wifi dongle as a back up still operational.

Conclusion: Order the PCB with TLIN1027, not TJA1027.

I hope this info assists someone going through the same issues.