我计划建立一个本地LoRa网络，它有一个接收器（在Raspberry Pi Zero上运行Python）和几个发射器（在Arduino上运行C代码）。
为了开始这一点，我测试了Adafruit和其他几个在线教程的一些草图，并可以使用RFM 95模块获得一个发射器和接收器进行通信。
但问题是，当Python代码读取LoRa数据包时，它会从源发送的数据包中删除前4个字符。
我们能做些什么来解决这个问题？我怀疑这可能是一个字节/字符串转换问题，但我还不能让它工作。
发送器代码（Arduino上的C）：
....
void loop() {
Serial.print("Sending - Packet:");
Serial.println(msgCount);
LoRa.beginPacket();
LoRa.print("Packet:");
LoRa.print(msgCount);
LoRa.endPacket();
msgCount++;
delay(5000);
}
.......接收器代码（PiZero上的Python）：
.......
while True:
packet = None
packet = rfm9x.receive()
if packet is None:
print('Waiting for PKT')
else:
prev_packet = packet
packet_text = str(prev_packet, "utf-8")
print(packet_text)
time.sleep(1)
time.sleep(0.1)
........接收器的预期输出：
Packet:1
Packet:2
Packet:3
.......
Packet:10
Packet:11
........接收器的实际输出：
et:1
et:2
et:3
.......
et:10
et:11
.......我尝试了以下方法，但没有成功：
packet_text = prev_packet.decode("ascii", 'ignore')
packet_text = prev_packet.decode("utf-8", 'ignore')感谢您的帮助！谢谢你，谢谢
1条答案
按热度按时间flvlnr441#
您似乎错过了RFM9x.receive（）的文档：
`receive(*, keep_listening: bool = True, with_header: bool = False, with_ack: bool = False, timeout: float | None = None) → bytearray | None
Wait to receive a packet from the receiver. If a packet is found the payload bytes are returned, otherwise None is returned (which indicates the timeout elapsed with no reception). If keep_listening is True (the default) the chip will immediately enter listening mode after reception of a packet, otherwise it will fall back to idle mode and ignore any future reception. All packets must have a 4-byte header for compatibility with the RadioHead library. The header consists of 4 bytes (To,From,ID,Flags). The default setting will strip the header before returning the packet to the caller. If with_header is True then the 4 byte header will be returned with the packet. The payload then begins at packet[4]. If with_ack is True, send an ACK after receipt (Reliable Datagram mode)
我们能做些什么来解决这个问题？ 可以发送一个header或使用with_header = True`。