Hi.
I have two WIFI modules for curtain, the modules come with TUYAMCU and CB3S BK chip.
One of the modules does not work at all (it arrived defective) and I managed to burn it in the second one.
I can't get the TUYA driver to work. No matter what I tried, I don't get a HEARTBEAT in log.
I disassembled the defective module to understand where all the GPIOS go and I see that RX and TX in the BK chip are not connected to anything, while PAD 14 and PAD25 go to TUYAMCU.
And in CONFIG I didn't find anywhere how to configure the RX and TX of the TUYAMCU.
I suspect that I don't have any communication with the TUYA chip because of this.
I would appreciate help on how to use this module.
By the way, before I burned I backed up the firmware and connected the module to the TUYA app at first, where I saw that the module was indeed working. I also managed to export the DP IDS from the TUYA cloud.
AI: What firmware/build are you running on the CB3S now (for example OpenBeken version), and can you post your current config/template plus the exact TUYA/UART commands or settings you already tried?
Built on Mar 31 2026 18:02:39 version 1.18.282
AI: Can you share the exact module/device model or clear PCB photos/log output from boot, especially showing PAD14/PAD25 connections and the log where no HEARTBEAT appears?
I have two WIFI modules for curtain, the modules come with TUYAMCU and CB3S BK chip.
One of the modules does not work at all (it arrived defective) and I managed to burn it in the second one.
I can't get the TUYA driver to work. No matter what I tried, I don't get a HEARTBEAT in log.
I disassembled the defective module to understand where all the GPIOS go and I see that RX and TX in the BK chip are not connected to anything, while PAD 14 and PAD25 go to TUYAMCU.
And in CONFIG I didn't find anywhere how to configure the RX and TX of the TUYAMCU.
I suspect that I don't have any communication with the TUYA chip because of this.
I would appreciate help on how to use this module.
By the way, before I burned I backed up the firmware and connected the module to the TUYA app at first, where I saw that the module was indeed working. I also managed to export the DP IDS from the TUYA cloud.
{
"result": {
"model": {
"modelId": "eu2emk",
"services": [
{
"name": "Default Service",
"description": "",
"code": "",
"actions": [],
"events": [],
"properties": [
{
"abilityId": 1,
"accessMode": "rw",
"code": "control",
"name": "Curtain Switch (Channel 1)",
"description": "",
"extensions": {
"iconName": "icon-a_power",
"attribute": "1280"
},
"typeSpec": {
"type": "enum",
"range": ["open", "stop", "close"]
}
},
{
"abilityId": 8,
"accessMode": "rw",
"code": "control_back",
"name": "Motor Direction",
"description": "",
"extensions": {
"iconName": "icon-dp_loop",
"attribute": "1024"
},
"typeSpec": {
"type": "enum",
"range": ["forward", "back"]
}
},
{
"abilityId": 10,
"accessMode": "rw",
"code": "tr_timecon",
"name": "Travel Time Setting",
"description": "",
"extensions": {
"iconName": "icon-dp_time2",
"attribute": "1024"
},
"typeSpec": {
"type": "value",
"min": 1,
"max": 120,
"step": 1,
"scale": 0,
"unit": "seconds"
}
}
]
}
]
}
},
"success": true,
"t": 1775333992021,
"tid": "a2fb1313306311f1b9c19e6068def229"
}
AI: What firmware/build are you running on the CB3S now (for example OpenBeken version), and can you post your current config/template plus the exact TUYA/UART commands or settings you already tried?
Built on Mar 31 2026 18:02:39 version 1.18.282
startDriver TuyaMCU
tuyaMcu_defWiFiState 4
linkTuyaMCUOutputToChannel 1 4 1
linkTuyaMCUOutputToChannel 8 4 2
linkTuyaMCUOutputToChannel 10 2 3
AI: Can you share the exact module/device model or clear PCB photos/log output from boot, especially showing PAD14/PAD25 connections and the log where no HEARTBEAT appears?
Info:MAIN:Time 25, idle 351869/s, free 67976, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MAIN:Time 26, idle 190128/s, free 56280, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 3/38
Info:MAIN:Time 27, idle 367936/s, free 55360, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 3/38
Info:MAIN:Time 28, idle 172097/s, free 67760, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 3/38
Info:MAIN:Time 29, idle 185260/s, free 67976, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MQTT:mqtt_host empty, not starting mqtt
Info:MAIN:Time 30, idle 175285/s, free 67760, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 3/38
Info:GEN:dhcp=0 ip=192.168.1.137 gate=192.168.0.1 mask=255.255.254.0 mac=80:64:7c:9a:4e:fe
Info:GEN:sta: 1, softap: 0, b/g/n
Info:GEN:sta:rssi=-49,ssid=AAA-IoT,bssid=da:b3:70:19:8f:9f,channel=11,cipher_type:CCMP
Info:CMD:[WebApp Cmd 'loglevel 3' Result] OK
Info:MAIN:Time 31, idle 174586/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MAIN:Time 32, idle 173932/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MAIN:Time 33, idle 177512/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
Debug:CMD:loglevel set 6
Info:CMD:[WebApp Cmd 'loglevel 6' Result] OK
ExtraDebug:TuyaMCU:TuyaMCU heartbeat_valid = 0, product_information_valid=0, self_processing_mode = 1, wifi_state_valid = 0, wifi_state_timer=0
Info:MAIN:Time 34, idle 176658/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
ExtraDebug:TuyaMCU:TuyaMCU heartbeat_valid = 0, product_information_valid=0, self_processing_mode = 1, wifi_state_valid = 0, wifi_state_timer=0
Info:MAIN:Time 35, idle 192679/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
ExtraDebug:TuyaMCU:TuyaMCU heartbeat_valid = 0, product_information_valid=0, self_processing_mode = 1, wifi_state_valid = 0, wifi_state_timer=0
Info:MAIN:Time 36, idle 178191/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
ExtraDebug:TuyaMCU:TuyaMCU heartbeat_valid = 0, product_information_valid=0, self_processing_mode = 1, wifi_state_valid = 0, wifi_state_timer=0
Info:MAIN:Time 37, idle 175838/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
ExtraDebug:TuyaMCU:TuyaMCU heartbeat_valid = 0, product_information_valid=0, self_processing_mode = 1, wifi_state_valid = 0, wifi_state_timer=0
Info:MAIN:Time 38, idle 176425/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
ExtraDebug:TuyaMCU:TuyaMCU heartbeat_valid = 0, product_information_valid=0, self_processing_mode = 1, wifi_state_valid = 0, wifi_state_timer=0
Info:MAIN:Time 39, idle 173870/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
ExtraDebug:TuyaMCU:TuyaMCU heartbeat_valid = 0, product_information_valid=0, self_processing_mode = 1, wifi_state_valid = 0, wifi_state_timer=0
Info:MAIN:Time 40, idle 176143/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:GEN:dhcp=0 ip=192.168.1.137 gate=192.168.0.1 mask=255.255.254.0 mac=80:64:7c:9a:4e:fe
Info:GEN:sta: 1, softap: 0, b/g/n
Info:GEN:sta:rssi=-51,ssid=AAA-IoT,bssid=da:b3:70:19:8f:9f,channel=11,cipher_type:CCMP
ExtraDebug:TuyaMCU:TuyaMCU heartbeat_valid = 0, product_information_valid=0, self_processing_mode = 1, wifi_state_valid = 0, wifi_state_timer=0
Info:MAIN:Time 41, idle 169436/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
ExtraDebug:TuyaMCU:TuyaMCU heartbeat_valid = 0, product_information_valid=0, self_processing_mode = 1, wifi_state_valid = 0, wifi_state_timer=0
Info:MAIN:Time 42, idle 176835/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
ExtraDebug:TuyaMCU:TuyaMCU heartbeat_valid = 0, product_information_valid=0, self_processing_mode = 1, wifi_state_valid = 0, wifi_state_timer=0
Info:MAIN:Time 43, idle 174642/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
ExtraDebug:TuyaMCU:TuyaMCU heartbeat_valid = 0, product_information_valid=0, self_processing_mode = 1, wifi_state_valid = 0, wifi_state_timer=0
Info:MAIN:Time 44, idle 173656/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
Debug:API:POST to api/cmnd
Debug:CMD:cmd [loglevel 4]
Debug:CMD:loglevel set 4
Info:CMD:[WebApp Cmd 'loglevel 4' Result] OK
Info:MAIN:Time 45, idle 186635/s, free 67976, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MQTT:mqtt_host empty, not starting mqtt
Info:MAIN:Time 46, idle 175234/s, free 67760, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 3/38
Info:MAIN:Time 47, idle 178428/s, free 67976, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MAIN:Time 48, idle 190155/s, free 67976, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MAIN:Time 49, idle 174938/s, free 67976, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MAIN:Time 50, idle 176564/s, free 59368, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 3/38
Info:GEN:dhcp=0 ip=192.168.1.137 gate=192.168.0.1 mask=255.255.254.0 mac=80:64:7c:9a:4e:fe
Info:GEN:sta: 1, softap: 0, b/g/n
Info:GEN:sta:rssi=-49,ssid=AAA-IoT,bssid=da:b3:70:19:8f:9f,channel=11,cipher_type:CCMP
Info:MAIN:Time 51, idle 173811/s, free 67976, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MAIN:Time 52, idle 177397/s, free 67976, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MAIN:Time 53, idle 178913/s, free 67976, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MAIN:Time 54, idle 178207/s, free 59376, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 3/38
Debug:API:POST to api/cmnd
Debug:CMD:cmd [logfeature 23 0]
Debug:CMD:logfeature set 0x037FFDFF
Info:CMD:[WebApp Cmd 'logfeature 23 0' Result] OK
Info:MAIN:Time 55, idle 174877/s, free 67976, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MAIN:Time 56, idle 177293/s, free 67976, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MAIN:Time 57, idle 179694/s, free 67976, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 2/38
Info:MAIN:Time 58, idle 185230/s, free 67976, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 2/38
Debug:API:POST to api/cmnd
Debug:CMD:cmd [logfeature 8 0]
Debug:CMD:logfeature set 0x037FFCFF
Info:CMD:[WebApp Cmd 'logfeature 8 0' Result] OK
Debug:CMD:cmd [logfeature 2 0]
Debug:CMD:logfeature set 0x037FFCFB
Info:CMD:[WebApp Cmd 'logfeature 2 0' Result] OK
Debug:CMD:cmd [logfeature 10 0]
Info:MAIN:Time 59, idle 170241/s, free 67672, MQTT 0(3), bWifi 1, secondsWithNoPing -1, socks 2/38