ESP32S3 – E22-900T22S not working

Hello Renzo, I'm encountering some issues with the E22-900T22S modules. Here's some context: I have two boards: - The first board (Flag) is equipped with an ESP32. - The second board (Master) is equipped with an ESP32-S3. The Flag board works correctly; I'm able to successfully send and receive data between Flag boards. However, sending data from the Master to the Flag board isn't working. When retrieving the module configuration for the first time, I get error code 11: "Save mode not recognized." This issue occurs only during the initial attempt. Afterward, when configuring the E22 module, I receive a "success" message, and retrieving the configuration afterward returns the correct settings. Nevertheless, I'm uncertain whether the returned values are reliable.

RX MIC ---> 17
TX MIC ---> 18
AUX ---> 38
M0 ---> 40
M1 ---> 39
Init RX MIC!
TX MIC pin!
Init AUX pin!
Init M0 pin!
Init M1 pin!
Begin ex
Begin Hardware Serial
Begin
1
9600
134217756
17
18
MODE NORMAL!
AUX HIGH!
Complete!
MODE CONFIGURATION!
AUX HIGH!
Complete!
3
Available buffer: 12 structure size: 12
AUX HIGH!
Complete!
----------------------------------------
HEAD : FC C1 0

AddH : 9
AddL : 0
NetID : 6

Chan : 0 -> 850MHz

SpeedParityBit     : 10 -> 8E1
SpeedUARTDatte     : 0 -> 1200bps
SpeedAirDataRate   : 10 -> 2.4kbps (default)

OptionSubPacketSett: 1 -> 128bytes
OptionTranPower    : 10 -> 13dBm
OptionRSSIAmbientNo: 1 -> Enabled

TransModeWORPeriod : 100 -> 2500ms
TransModeTransContr: 0 -> WOR Receiver (default)
TransModeEnableLBT : 0 -> Disabled (default)
TransModeEnableRSSI: 0 -> Disabled (default)
TransModeEnabRepeat: 0 -> Disabled (default)
TransModeFixedTrans: 0 -> Transparent transmission (default)
----------------------------------------
MODE NORMAL!
AUX HIGH!
Complete!
Save mode returned not recognized!
11
---------------------------------------------
Parametres du module LoRa avant configuration
---------------------------------------------
----------------------------------------
HEAD : FC C1 0

AddH : 9
AddL : 0
NetID : 6

Chan : 0 -> 850MHz

SpeedParityBit     : 10 -> 8E1
SpeedUARTDatte     : 0 -> 1200bps
SpeedAirDataRate   : 10 -> 2.4kbps (default)

OptionSubPacketSett: 1 -> 128bytes
OptionTranPower    : 10 -> 13dBm
OptionRSSIAmbientNo: 1 -> Enabled

TransModeWORPeriod : 100 -> 2500ms
TransModeTransContr: 0 -> WOR Receiver (default)
TransModeEnableLBT : 0 -> Disabled (default)
TransModeEnableRSSI: 0 -> Disabled (default)
TransModeEnabRepeat: 0 -> Disabled (default)
TransModeFixedTrans: 0 -> Transparent transmission (default)
----------------------------------------
MODE CONFIGURATION!
AUX HIGH!
Complete!
AUX HIGH!
Complete!
Clear buffer...ok!
Available buffer: 12 structure size: 12
AUX HIGH!
Complete!
----------------------------------------
HEAD : C1 0 9

AddH : 0
AddL : 6
NetID : 12

Chan : 4 -> 854MHz

SpeedParityBit     : 0 -> 8N1 (Default)
SpeedUARTDatte     : 11 -> 9600bps (default)
SpeedAirDataRate   : 10 -> 2.4kbps (default)

OptionSubPacketSett: 0 -> 240bytes (default)
OptionTranPower    : 0 -> 22dBm (Default)
OptionRSSIAmbientNo: 0 -> Disabled (default)

TransModeWORPeriod : 11 -> 2000ms (default)
TransModeTransContr: 0 -> WOR Receiver (default)
TransModeEnableLBT : 0 -> Disabled (default)
TransModeEnableRSSI: 0 -> Disabled (default)
TransModeEnabRepeat: 0 -> Disabled (default)
TransModeFixedTrans: 1 -> Fixed transmission (first three bytes can be used as high/low address and channel)
----------------------------------------
MODE NORMAL!
AUX HIGH!
Complete!
Success
1
---------------------------------------------
Parametres du module LoRa apres configuration
---------------------------------------------
MODE CONFIGURATION!
AUX HIGH!
Complete!
3
Available buffer: 12 structure size: 12
AUX HIGH!
Complete!
----------------------------------------
HEAD : C1 0 9

AddH : 0
AddL : 6
NetID : 12

Chan : 4 -> 854MHz

SpeedParityBit     : 0 -> 8N1 (Default)
SpeedUARTDatte     : 11 -> 9600bps (default)
SpeedAirDataRate   : 10 -> 2.4kbps (default)

OptionSubPacketSett: 0 -> 240bytes (default)
OptionTranPower    : 0 -> 22dBm (Default)
OptionRSSIAmbientNo: 0 -> Disabled (default)

TransModeWORPeriod : 11 -> 2000ms (default)
TransModeTransContr: 0 -> WOR Receiver (default)
TransModeEnableLBT : 0 -> Disabled (default)
TransModeEnableRSSI: 0 -> Disabled (default)
TransModeEnabRepeat: 0 -> Disabled (default)
TransModeFixedTrans: 1 -> Fixed transmission (first three bytes can be used as high/low address and channel)
----------------------------------------
MODE NORMAL!
AUX HIGH!
Complete!
Success
1
----------------------------------------
HEAD : C1 0 9

AddH : 0
AddL : 6
NetID : 12

Chan : 4 -> 854MHz

SpeedParityBit     : 0 -> 8N1 (Default)
SpeedUARTDatte     : 11 -> 9600bps (default)
SpeedAirDataRate   : 10 -> 2.4kbps (default)

OptionSubPacketSett: 0 -> 240bytes (default)
OptionTranPower    : 0 -> 22dBm (Default)
OptionRSSIAmbientNo: 0 -> Disabled (default)

TransModeWORPeriod : 11 -> 2000ms (default)
TransModeTransContr: 0 -> WOR Receiver (default)
TransModeEnableLBT : 0 -> Disabled (default)
TransModeEnableRSSI: 0 -> Disabled (default)
TransModeEnabRepeat: 0 -> Disabled (default)
TransModeFixedTrans: 1 -> Fixed transmission (first three bytes can be used as high/low address and channel)
----------------------------------------
Hi, I'm going to send message!
0AUX HIGH!
Complete!
Clear buffer...ok!
Success

Despite using the same NET-ID, Channel, and properly setting the LOW_ADDRESS of the receiver, I'm unable to send data from the Master to the Flag board in fixed transmission mode. The transmission returns "success" on the Master, but the Flag board doesn't receive anything. Here are my questions: - What exactly does the error "Save mode not recognized" mean? - Could my issue be hardware-related? - I'm not currently using any pull-up resistors. Could this cause problems? - Can the length of the AUX, RX, and TX traces affect the transmission? For reference, here are the trace lengths on my setup: - AUX: 21.6 mm - LORA_RX: 34.6 mm - LORA_TX: 39.2 mm I've already tested with a new Ebyte module, but the issue persists. I can share my code if needed. Thanks for your help! Thomas