Garbled packets on Heltec wifi lora stick v3 #31
Description
Boards: https://heltec.org/project/wireless-stick-v3/
Trying to send "hello" messages between the two of these and instead receiving garbled (seemingly not random as they repeat) characters:
loragate/debug [D][lora_mqtt_bridge.sensor:101]: received packet: ?@m$
loragate/debug [D][lora_mqtt_bridge.sensor:070]: Packet size: 5
loragate/debug [D][lora_mqtt_bridge.sensor:101]: received packet: z?H?
loragate/debug [D][lora_mqtt_bridge.sensor:070]: Packet size: 5
loragate/debug [D][lora_mqtt_bridge.sensor:101]: received packet: z?H?
loragate/debug [D][lora_mqtt_bridge.sensor:070]: Packet size: 5
loragate/debug [D][lora_mqtt_bridge.sensor:101]: received packet: ???s
loragate/debug [D][lora_mqtt_bridge.sensor:070]: Packet size: 5
loragate/debug [D][lora_mqtt_bridge.sensor:101]: received packet: ???s
loragate/debug [D][lora_mqtt_bridge.sensor:070]: Packet size: 5
loragate/debug [D][lora_mqtt_bridge.sensor:101]: received packet: ???s
Transmitter initialization code:
if (!LoRa.begin(cs_pin, reset_pin, busy_pin, dio0_pin, -1, -1)) {
ESP_LOGE(TAG, "Failed to setup LoRa, mode: %d, error: %d", LoRa.getMode(), LoRa.getError());
this->mark_failed();
return;
}
uint8_t dio3Voltage = SX126X_DIO3_OUTPUT_1_8;
uint32_t tcxoDelay = SX126X_TCXO_DELAY_10;
LoRa.setDio3TcxoCtrl(dio3Voltage, tcxoDelay);
LoRa.setTxPower(17, SX126X_TX_POWER_SX1262); // TX power +17 dBm for SX1262
LoRa.setSyncWord(_sync);
LoRa.setFrequency(_frequency);
ESP_LOGI(TAG, "LoRa Modulation: spread=%d, bandwidth=%d, coding=%d", _spread, _bandwidth, _coding);
LoRa.setLoRaModulation(_spread, _bandwidth, _coding, false);
uint8_t headerType = SX126X_HEADER_EXPLICIT; // Explicit header mode
uint16_t preambleLength = 12; // Set preamble length to 12
uint8_t payloadLength = 255; // Initialize payloadLength to 15
bool crcType = false; // Set CRC enable
LoRa.setLoRaPacket(headerType, preambleLength, payloadLength, crcType);
Transmitter code:
LoRa.beginPacket();
LoRa.write("hello", 5);
if (LoRa.endPacket(20))
ESP_LOGI(TAG, "sent a packet");
else {
ESP_LOGW(TAG, "failed to send a packet");
return;
}
LoRa.wait(200);
Receiver initialization code:
if (!LoRa.begin(cs_pin, reset_pin, busy_pin, dio0_pin, -1, -1)) {
ESP_LOGE(TAG, "Failed to setup LoRa, mode: %d, error: %d", LoRa.getMode(), LoRa.getError());
this->mark_failed();
return;
}
// Configure TCXO or XTAL used in RF module
uint8_t dio3Voltage = SX126X_DIO3_OUTPUT_1_8;
uint32_t tcxoDelay = SX126X_TCXO_DELAY_10;
LoRa.setDio3TcxoCtrl(dio3Voltage, tcxoDelay);
// Set RX gain to boosted gain
LoRa.setRxGain(SX126X_RX_GAIN_BOOSTED);
LoRa.setFrequency(_frequency);
ESP_LOGI(TAG, "LoRa Modulation: spread=%d, bandwidth=%d, coding=%d", _spread, _bandwidth, _coding);
LoRa.setLoRaModulation(_spread, _bandwidth, _coding, false);
LoRa.setSyncWord(_sync);
uint8_t headerType = SX126X_HEADER_EXPLICIT; // Explicit header mode
uint16_t preambleLength = 12; // Set preamble length to 12
uint8_t payloadLength = 255; // Initialize payloadLength to 15
bool crcType = false; // Set CRC enable
LoRa.setLoRaPacket(headerType, preambleLength, payloadLength, crcType);
if (!LoRa.request(SX126X_RX_CONTINUOUS)) {
ESP_LOGE(TAG, "Failed to request continuous listening");
this->mark_failed();
return;
}
ESP_LOGI(TAG, "Initialized LoRa");
Receiver code:
size_t _packet_size = LoRa.available();
if (_packet_size == 0) {
return;
}
ESP_LOGD(TAG, "Packet size: %d", _packet_size);
char received_string[_packet_size];
// received data
for(int i = 0; i < _packet_size; i++) {
received_string[i] = LoRa.read();
}
ESP_LOGI(TAG, "received packet: %s", received_string);
Spent the whole day trying to figure out waidw. Please help, thank you!